A sheet metal riveting device for processing magnesium alloy sheet metal brackets

Abstract

The application discloses a sheet metal riveting device for magnesium alloy sheet metal support machining, and relates to the technical field of sheet metal machining equipment, which comprises a machining table, a driving mechanism is installed on the top of the machining table, a plurality of riveting rollers are installed on the executing end of the driving mechanism, a rectangular table is installed on the top of the machining table, and a placing rack and three riveting seats are fixedly connected to the top of the rectangular table. The cooperation of the three riveting seats and other parts enables the sheet metal workpiece to firstly pass through the leftmost abutting groove with the largest preliminary compression deformation and fail to reach the final depth, then pass through the middle abutting groove to further compress the deformation, and finally pass through the rightmost abutting groove with the final depth to complete the final forming of the rivet. The rough machining and then fine machining mode avoids the one-time excessive deformation of the sheet metal workpiece, prevents the sheet metal workpiece from being cracked or torn due to stress concentration, and improves the precision of the riveting of the sheet metal workpiece and the yield of the finished product after the riveting.

Description

Technical Field

[0001] This invention relates to the field of sheet metal processing equipment technology, specifically a sheet metal riveting device for processing magnesium alloy sheet metal brackets. Background Technology

[0002] Magnesium alloys are alloys composed of magnesium as a base and other elements added. Their characteristics include: low density, high strength, high elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloys, and good resistance to corrosion from organic substances and alkalis. The main alloying elements include aluminum, zinc, manganese, cerium, thorium, and small amounts of zirconium or cadmium. Magnesium-aluminum alloys are the most widely used, followed by magnesium-manganese alloys and magnesium-zinc-zirconium alloys. They are mainly used in aerospace, transportation, chemical, and rocket industries. For magnesium alloy sheet metal brackets, sheet metal riveting devices are required.

[0003] In existing technologies, when riveting magnesium alloy sheet metal brackets, the rivets must be manually placed in designated positions, and then an automatic feeding mechanism transports the rivets to the brackets. Finally, a riveting device completes the riveting operation. However, when using one-piece formed rivets for riveting, sudden changes in local stress can easily lead to defects such as cracking at the edge of the riveting hole and scratches on the sheet metal surface. These defects significantly reduce the quality stability of the riveting process, resulting in a decrease in the finished product qualification rate and adversely affecting production efficiency. To address these issues, we provide a sheet metal riveting device for processing magnesium alloy sheet metal brackets. Summary of the Invention

[0004] The purpose of this invention is to provide a sheet metal riveting device for processing magnesium alloy sheet metal brackets, in order to solve the problem that the rivets formed in one step are prone to cracking at the edge of the riveting hole and scratching of the sheet metal surface due to sudden changes in local stress during the riveting process of magnesium alloy sheet metal brackets, thereby reducing quality stability, finished product qualification rate and production efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sheet metal riveting device for processing magnesium alloy sheet metal brackets, comprising: a processing table, a driving mechanism mounted on the top of the processing table, multiple riveting rollers mounted on the execution end of the driving mechanism, a rectangular platform mounted on the top of the processing table, a placement frame and three riveting seats fixedly connected to the top of the rectangular platform, a conveying mechanism, a segmented riveting unit and a guide assembly respectively provided on the top of the rectangular platform, an automatic rivet feeder mounted on the outer wall of the leftmost riveting seat, the automatic rivet feeder conveying rivets to the top of the leftmost riveting seat, sheet metal workpieces placed on the top of the placement frame, and the conveying mechanism sequentially conveying the sheet metal workpieces placed on the top of the placement frame. The sheet metal workpiece is fed to the three riveting seats, so that the rivet placed on the top of the leftmost riveting seat begins to be riveted. The conveying mechanism includes a motor fixedly connected to one side of the rectangular platform. The actuator end of the motor is fixedly connected to a first pulley. The top of the rectangular platform is fixedly connected to two fixed seats, and the two fixed seats are symmetrically arranged about the center of the rectangular platform. A connecting rod is rotatably connected to the inner side of each of the two fixed seats. A sprocket is fixedly connected to each end of the connecting rod through the outside of the fixed seat. A second pulley is fixedly connected to the outer wall of one of the connecting rods. A belt is installed on the outer wall of the first pulley and the second pulley. A chain is installed on the outer wall of every two sprockets.

[0006] As a further embodiment of the present invention: the conveying mechanism further includes multiple sets of fixing frames respectively fixedly connected to the outer walls of the two chains, each set of fixing frames has two members, and the two fixing frames are respectively fixed to both sides of one chain. A connecting plate is fixedly connected to the top of each pair of fixing frames. A first support plate is provided on one side of the connecting plate, and a second support plate is fixedly connected to one side of the first support plate through a rectangular connecting rod. A support rod is fixedly connected to the top of the rectangular platform and the processing table respectively, and a feeding channel is fixedly connected to the top of the support rod.

[0007] As a further embodiment of the present invention: the conveying mechanism further includes trapezoidal grooves formed on the sidewalls of each of the first pallets, a trapezoidal slider slidably connected to the inner side of the trapezoidal groove, a first spring installed between the trapezoidal slider and the trapezoidal groove, one side of the trapezoidal slider being fixedly connected to the end of the connecting plate, a second spherical rod being fixedly connected to the bottom of the first pallet, two sets of fixing plates being fixedly connected to the top of the rectangular platform, each set of fixing plates having multiple plates, and a trapezoidal block abutting against the second spherical rod being fixedly connected to the top of each fixing plate, a limiting plate being fixedly connected to one side of each set of fixing plates, and the limiting plate abutting against the bottom of the chain, and an auxiliary component for clamping the sheet metal workpiece being provided on the inner side of the first pallet.

[0008] As a further embodiment of the present invention: the auxiliary component includes two clamping plates, each disposed inside the first pallet. A first spherical rod is fixedly connected to one side of each clamping plate. One end of the first spherical rod extends through to the outside of the first pallet and is slidably connected to the first pallet. A circular plate is fixedly connected to the outer wall of the first spherical rod. A second spring is installed between the circular plate and the first pallet. A columnar connecting rod is fixedly connected to both sides of the connecting plate. An abutting block that abuts against the first spherical rod is fixedly connected to one end of each of the two columnar connecting rods.

[0009] As a further aspect of the present invention: the segmented riveting unit includes an abutment groove formed inside each of the riveting seats, the depth of the abutment groove decreasing from left to right.

[0010] As a further embodiment of the present invention: the guide assembly includes a plurality of cylindrical slide grooves, each formed inside two of the rivet seats, wherein a lifting rod is slidably connected to the inner side of each of the two cylindrical slide grooves, and two auxiliary blocks are fixedly connected to the outer wall of the lifting rod. Furthermore, a moving groove matching the auxiliary block is formed on the inner side of each of the two cylindrical slide grooves, and the auxiliary block is slidably connected to the cylindrical slide groove through the moving groove. A third spring is installed between each lifting rod and one of the cylindrical slide grooves.

[0011] As a further embodiment of the present invention: the guide assembly further includes a plurality of auxiliary seats that are fixedly connected to the inner sides of two of the abutment grooves. Each auxiliary seat has an inclined plate rotatably connected to its inner side via a rotating shaft. The ends of the plurality of inclined plates are arc-shaped, and the diameter of the arc matches the diameter of the rivet.

[0012] As a further embodiment of the present invention: the guide assembly further includes an auxiliary plate fixedly connected to the inner side of the abutment groove, the inner side of the auxiliary plate having a plurality of arc-shaped grooves, and an arc-shaped spring installed between each of the inclined plates and one of the arc-shaped grooves.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By setting up three rivet bases and other parts, the depth of the abutment grooves inside the three rivet bases decreases from left to right. This allows the sheet metal workpiece to be initially pressed in through the deepest abutment groove on the left, resulting in a large deformation but not reaching the final depth. Then, it is further compressed through the middle abutment groove, resulting in a smaller deformation. Finally, the rivet is formed through the abutment groove on the right with the final depth. The deepest abutment groove on the left has the largest initial deformation, allowing the sheet metal to initially embed the rivet to a large extent in the early stage of riveting, but not reaching the final shape. This method of roughing first and then finishing avoids excessive deformation at one time, which can cause the sheet metal workpiece to crack or tear due to stress concentration. This improves the accuracy of riveting the sheet metal workpiece and the yield of the finished product after riveting.

[0015] 2. By setting up the coordination of parts such as chains, and through the mutual cooperation of the chains with the first and second pallets, sheet metal workpieces can be continuously placed from the placement rack onto the riveting seat that needs to be riveted for the first time. At the same time, the sheet metal workpiece that has been riveted for the first time is placed onto the riveting seat that needs to be riveted for the second time, and the sheet metal workpiece that has been riveted for the second time is placed onto the riveting seat that needs to be riveted for the third time. The sheet metal workpiece that has been riveted for the third time is automatically unloaded. This allows the device to perform continuous riveting operations, thereby improving the riveting efficiency and thus improving the processing efficiency of the workpieces.

[0016] 3. By setting up clamping plates and other parts, when the first pallet moves upward a certain distance, the first pallet drives the two first spherical rods to abut against the inclined surface of an abutment block respectively. When the second spherical rod moves to near the highest point of the trapezoidal block, the first spherical rod contacts the lowest point of the inclined surface of the abutment block. When the second spherical rod continues to move upward, the abutment block pushes the first spherical rod, and the first spherical rod drives the two clamping plates to clamp the two sides of the sheet metal workpiece. When the second spherical rod separates from one side of the inclined surface of the trapezoidal block, the two clamping plates clamp the two sides of the sheet metal workpiece, ensuring that the sheet metal workpiece is fixed in position on the riveting seat or pallet, avoiding deviation in the riveting position due to shaking or offset during the conveying process. Especially in multi-station continuous operation, precise positioning can ensure the consistency of riveting quality at each station.

[0017] 4. By setting up components such as inclined plates, when the rivet undergoes the first pressing and riveting operation inside the first abutment groove and undergoes slight deformation, and during the process of moving the sheet metal workpiece into the second rivet seat, when the rivet contacts the inclined plate, the sheet metal workpiece will use its own weight to make the bottom of the rivet contact the inclined plate, and then move towards the center of the rivet seat under the action of the inclined plate. This allows the rivet to be accurately placed in the designated position during the initial placement process, thanks to the guiding effect of multiple inclined plates, so as to improve the accuracy of subsequent riveting.

[0018] 5. By setting up components such as inclined plates, when the rivet deviates slightly during the first riveting process, the rivet will press against the inclined plate when placed into the second rivet seat after the first riveting. When the second riveting is performed, the rivet will move towards the center of the rivet seat under the action of the inclined plate. This guides and calibrates the rivet that deviated during the initial riveting process, thereby further improving the accuracy of riveting.

[0019] 6. By coordinating components such as lifting rods, when the bottom of the rivet tilts, multiple lifting rods support the bottom of the sheet metal workpiece when it is placed above the rivet base. When the riveting roller performs the riveting operation, the sheet metal workpiece can move vertically downwards, preventing the workpiece from being uneven due to its tilted bottom. The lifting rods provide multiple points of uniform support to the bottom of the sheet metal workpiece, forming a rigid support plane. Even if the bottom of the rivet is initially tilted, the supporting force of the lifting rods can force the workpiece to maintain a horizontal posture, ensuring that the workpiece moves vertically downwards during riveting and avoiding unevenness caused by tilting. In a multi-station continuous riveting process, if the tilt of the workpiece in the previous station is not corrected, the error in subsequent stations will be amplified due to the reference deviation. The supporting function of the lifting rods recalibrates the vertical posture of the workpiece at each station, blocking the transmission of errors and ensuring consistent riveting accuracy at each station. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the top structure of the rectangular platform of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the chain drive mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the fixing frame structure of the present invention;

[0025] Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle;

[0026] Figure 7 This is a schematic diagram of the chain structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the rivet base structure of the present invention;

[0028] Figure 9 This is a cross-sectional view of the rivet base of the present invention;

[0029] Figure 10 For the present invention Figure 9 Enlarged view at point C;

[0030] Figure 11 These are three cross-sectional views of the rivet bases of the present invention.

[0031] In the diagram: 1. Processing table; 2. Drive mechanism; 3. Riveting roller; 4. Rectangular table; 5. Support rod; 6. Material unloading channel; 7. Placement rack; 8. Riveting base; 9. Sheet metal workpiece; 10. Fixing plate; 11. Chain; 12. Fixing seat; 13. Motor; 14. Connecting rod; 15. First pulley; 16. Belt; 17. Second pulley; 18. Sprocket; 19. Trapezoidal block; 20. Limiting plate; 21. Fixing frame; 22. Connecting plate; 23. First support plate; 24. Trapezoidal groove; 25. First spring; 26. Cylindrical connecting rod; 27. Abutment block; 28. First spherical rod; 29. ​​Circular plate; 30. Second spring; 31. Rectangular connecting rod; 32. Second support plate; 33. Second spherical rod; 34. Clamping plate; 35. Auxiliary seat; 36. Inclined plate; 37. Lifting rod; 38. Auxiliary plate; 39. Cylindrical groove; 40. Auxiliary block; 41. Third spring; 42. Arc groove; 43. Arc spring; 44. Abutment groove; 45. Rivet; 46. Trapezoidal slider. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] Please see Figures 1 to 11This embodiment provides a sheet metal riveting device for processing magnesium alloy sheet metal brackets, including: a processing table 1, a driving mechanism 2 installed on the top of the processing table 1, a plurality of riveting rollers 3 installed on the execution end of the driving mechanism 2, a rectangular table 4 installed on the top of the processing table 1, a placement frame 7 and three rivet seats 8 fixedly connected to the top of the rectangular table 4, a conveying mechanism, a segmented riveting unit and a guide assembly respectively provided on the top of the rectangular table 4, an automatic rivet feeder installed on the outer wall of the leftmost rivet seat 8, the automatic rivet feeder conveys rivets 45 to the top of the leftmost rivet seat 8, a sheet metal workpiece 9 is placed on the top of the placement frame 7, the conveying mechanism conveys the sheet metal workpiece 9 placed on the top of the placement frame 7 to the three rivet seats 8 in sequence, so that the sheet metal workpiece 9 and the rivet 45 placed on the top of the leftmost rivet seat 8 begin to be riveted;The conveying mechanism includes a motor 13 fixedly connected to one side of a rectangular platform 4. A first pulley 15 is fixedly connected to the actuating end of the motor 13. Two fixed seats 12 are fixedly connected to the top of the rectangular platform 4, and the two fixed seats 12 are symmetrically arranged about the center of the rectangular platform 4. A connecting rod 14 is rotatably connected to the inner side of each of the two fixed seats 12. A sprocket 18 is fixedly connected to both ends of the connecting rod 14, extending to the outside of the fixed seat 12. A second pulley 17 is fixedly connected to the outer wall of one of the connecting rods 14. A belt 16 is installed on the outer walls of the first pulley 15 and the second pulley 17. A chain 1 is installed on the outer wall of every two sprockets 18. 1. The conveying mechanism also includes multiple sets of fixing frames 21 fixedly connected to the outer walls of the two chains 11 respectively. Each set of fixing frames 21 has two frames, and the two fixing frames 21 are fixed to both sides of one chain 11 respectively. A connecting plate 22 is fixedly connected to the top of each pair of fixing frames 21. A first support plate 23 is provided on one side of the connecting plate 22. A second support plate 32 is fixedly connected to one side of the first support plate 23 through a rectangular connecting rod 31. A support rod 5 is fixedly connected to the top of the rectangular platform 4 and the processing table 1 respectively. A feeding channel 6 is fixedly connected to the top of the support rod 5. The conveying mechanism also includes trapezoidal grooves opened on the side walls of each first support plate 23. 24. A trapezoidal slider 46 is slidably connected to the inner side of the trapezoidal slide 24. A first spring 25 is installed between the trapezoidal slider 46 and the trapezoidal slide 24. One side of the trapezoidal slider 46 is fixedly connected to the end of the connecting plate 22. A second spherical rod 33 is fixedly connected to the bottom of the first support plate 23. Two sets of fixing plates 10 are fixedly connected to the top of the rectangular platform 4. Each set of fixing plates 10 has multiple plates, and each fixing plate 10 has a trapezoidal block 19 fixedly connected to its top that abuts against the second spherical rod 33. A limiting plate 20 is fixedly connected to one side of each set of fixing plates 10, and the limiting plate 20 abuts against the bottom of the chain 11. The first support plate 23... An auxiliary component for clamping sheet metal workpiece 9 is provided on the inner side. The auxiliary component includes two clamping plates 34, each disposed on the inner side of each first support plate 23. A first spherical rod 28 is fixedly connected to one side of each clamping plate 34. One end of the first spherical rod 28 extends through to the outside of the first support plate 23 and is slidably connected to the first support plate 23. A circular plate 29 is fixedly connected to the outer wall of the first spherical rod 28. A second spring 30 is installed between the circular plate 29 and the first support plate 23. A columnar connecting rod 26 is fixedly connected to both sides of the connecting plate 22. An abutting block 27 that abuts against the first spherical rod 28 is fixedly connected to one end of each columnar connecting rod 26.

[0035] The drive mechanism 2 is composed of a fixed frame, multiple cylinders and control elements. Since the riveting operation is already known, this solution does not elaborate on it.

[0036] The automatic rivet feeder is installed on the outer wall of the leftmost rivet seat 8. This device intermittently feeds rivets 45 to the top of the rivet seat 8. Since the operation of the automatic rivet feeder is existing technology, it will not be described in detail here.

[0037] Before the sheet metal workpiece 9 is placed above the rivet seat 8, the automatic rivet feeder delivers the rivet 45 to the top of the leftmost rivet seat 8, stops the motor 13, and then starts the drive mechanism 2 to drive the riveting roller 3 to rivet the sheet metal workpiece 9, ensuring that the relative position of the workpiece and the rivet 45 is accurate during riveting, improving the riveting quality and reducing the scrap rate.

[0038] When it is necessary to rivet the sheet metal workpiece 9, first place the sheet metal workpiece 9 on top of the placement rack 7, then start the motor 13 to drive the first pulley 15 to rotate. The first pulley 15 drives the second pulley 17 to rotate synchronously through the belt 16, and drives the sprocket 18 to rotate. At the same time, the sprocket 18 drives another sprocket 18 to rotate synchronously through the connecting rod 14. At this time, multiple sprockets 18 drive the chain 11 to rotate clockwise, and at the same time drive multiple fixing brackets 21 on the outer wall of the chain 11 to move synchronously. Thus, the fixing brackets 21 drive the first support plate 23 to move synchronously. After the first support plate 23 has moved a certain distance, the first support plate 23 and the second support plate 32 are located below the sheet metal workpiece 9. When the second spherical rod 33 and the trapezoidal block 19... The inclined surface abuts, and then the first support plate 23 continues to move laterally. When the second ball rod 33 moves from the lowest point to the highest point of the inclined surface of the trapezoidal block 19, the first support plate 23, under the push of the second ball rod 33, moves upward along the trapezoidal block 46 through the trapezoidal slide 24. This causes the first support plate 23 to lift the sheet metal workpiece 9 on the top of the placement rack 7 through the rectangular connecting rod 31 and move the sheet metal workpiece 9 towards the first rivet 8. When the second ball rod 33 moves from the highest point to the lowest point of the trapezoidal block 19, the first support plate 23 moves downward under the action of the first spring 25 and moves the sheet metal workpiece 9 to the top of the leftmost rivet 8 through the first support plate 23.

[0039] After the first riveting is completed, motor 13 is started again to repeat the above operation, conveying the sheet metal workpiece 9 above the leftmost riveting seat 8 to the top of the next riveting seat 8. (After the first riveting of the sheet metal workpiece 9, the rivet 45 at its bottom remains inside the abutment groove 44. During the process of the rivet 45 being lifted out of the riveting seat 8, because the rivet 45 is stuck inside the riveting seat 8, the first support plate 23 can slide at the bottom of the sheet metal workpiece 9. After the rivet 45 is lifted out of the riveting seat 8, the first support plate 23 and the second support plate 32 can drive the sheet metal workpiece 9 after the first riveting to move towards the second riveting seat 8.) Multiple sets of first pallets 23 can simultaneously transport sheet metal workpieces 9 on the placement rack 7 and three riveting seats 8, and transport the sheet metal workpieces 9 from left to right from the placement rack 7 to the three riveting seats 8. When the sheet metal workpiece 9 is transported to the top of the last riveting seat 8, the first pallet 23 continues to drag the sheet metal workpiece 9 forward. When the chain 11 turns, the first pallet 23 will rotate clockwise and transport the sheet metal workpiece 9 to the unloading channel 6, and then unload it from the unloading channel 6. This allows the device to perform continuous riveting operations, thereby improving the riveting efficiency and thus improving the processing efficiency of the workpieces.

[0040] While the chain 11 drives the sheet metal workpiece 9 to move through the first pallet 23, the limiting plate 20 supports the chain 11 from below. This prevents the sheet metal workpiece 9 from being placed in an inaccurate position due to the chain 11 sinking when the first pallet 23 is conveying it. By providing continuous support below the chain 11, the limiting plate 20 forces the chain 11 to maintain a horizontal straight-line movement trajectory, avoiding the pallet height from dropping due to the chain 11 sinking. This ensures the vertical height accuracy of the sheet metal workpiece 9 when it is finally placed on the rivet 8, thereby improving the accuracy of the equipment during conveying and thus improving the applicability of the equipment.

[0041] When the first pallet 23 moves upward a certain distance, the first pallet 23 drives the two first spherical rods 28 to abut against the inclined surface of an abutment block 27 respectively. When the second spherical rod 33 moves to near the highest point of the trapezoidal block 19, the first spherical rod 28 contacts the lowest point of the inclined surface of the abutment block 27. When the second spherical rod 33 continues to move upward, the abutment block 27 pushes the first spherical rod 28, and the first spherical rod 28 drives the two clamping plates 34 to clamp the two sides of the sheet metal workpiece 9. When the second spherical rod 33 separates from one side of the inclined surface of the trapezoidal block 19, the two clamping plates 34 clamp the two sides of the sheet metal workpiece 9 to ensure that the position of the sheet metal workpiece 9 on the rivet seat 8 or the pallet is fixed, avoiding the deviation of the riveting position caused by shaking or offset during the conveying process. Especially in multi-station continuous operation, precise positioning can ensure the consistency of riveting quality at each station.

[0042] After the first riveting is completed, when the first support plate 23 lifts the sheet metal workpiece 9, the clamping plate 34 has not yet come into contact with the sheet metal workpiece 9. This is because the movement trajectory of the first support plate 23 when it is lifted is obliquely upward, while the rivet 45 needs to be lifted vertically upward to completely separate from the rivet seat 8. At this time, when the first support plate 23 lifts the sheet metal workpiece 9 and continues to move, the sheet metal workpiece 9 will be displaced a certain distance on the first support plate 23, so that the rivet 45 can completely separate from the rivet seat 8. Then, when the first support plate 23 moves to the highest point of the trapezoidal block 19, the two clamping plates 34 clamp the sheet metal workpiece 9 to prevent the bottom of the sheet metal workpiece 9 from not completely separating from the rivet seat 8 when the first support plate 23 lifts the sheet metal workpiece 9, thus damaging the rivet 45 and improving the applicability of the equipment during processing.

[0043] Please see Figure 3 and Figure 11 The segmented riveting unit includes an abutment groove 44 formed inside each rivet seat 8, the depth of which decreases from left to right.

[0044] The depth of the abutment groove 44 on the inner side of the rightmost rivet 8 matches the depth of the abutment groove 44 on the inner side of the existing standard rivet 8.

[0045] Because the depth of the abutment grooves 44 inside the three rivet seats 8 decreases from left to right, the sheet metal workpiece 9 can be initially pressed in through the deepest abutment groove 44 on the left, resulting in a large deformation but not reaching the final depth. Then, it is further compressed through the middle abutment groove 44, resulting in a smaller deformation. Finally, the rivet 45 is finally formed through the abutment groove 44 on the right with the final depth. The deepest abutment groove 44 on the left initially causes the largest deformation, allowing the sheet metal to initially embed the rivet 45 with a large amount of material in the early stages of riveting, but not reaching the final shape. This method of roughing first and then finishing avoids excessive deformation at one time, which could cause the sheet metal workpiece 9 to crack or tear due to stress concentration. This improves the accuracy of riveting the sheet metal workpiece 9 and the yield rate after riveting.

[0046] Please see Figures 8-11The guide assembly includes multiple cylindrical grooves 39, each formed inside one of the two rivet seats 8. A lifting rod 37 is slidably connected to the inner side of each of the two cylindrical grooves 39. Two auxiliary blocks 40 are fixedly connected to the outer wall of each lifting rod 37. Each of the two cylindrical grooves 39 has a moving groove matching the auxiliary block 40. The auxiliary block 40 is slidably connected to the cylindrical groove 39 via the moving groove. A third spring 41 is installed between each lifting rod 37 and one cylindrical groove 39. The assembly also includes multiple auxiliary seats 35, which are fixedly connected to the inner sides of two of the abutment grooves 44. Each auxiliary seat 35 has an inclined plate 36 rotatably connected to its inner side via a pivot. The ends of the multiple inclined plates 36 are arc-shaped, and the diameter of the arc matches the diameter of the rivet 45. The guide assembly also includes an auxiliary plate 38 fixedly connected to the inner side of the abutment groove 44. Multiple arc-shaped grooves 42 are provided on the inner side of the auxiliary plate 38. An arc-shaped spring 43 is installed between each inclined plate 36 and an arc-shaped groove 42.

[0047] When the rivet 45 undergoes its first pressing operation inside the first abutment groove 44 and undergoes a slight deformation, and the sheet metal workpiece 9 is moved into the second rivet seat 8, the rivet 45 contacts the inclined plate 36. The sheet metal workpiece 9 will use its own weight to make the bottom of the rivet 45 contact the inclined plate 36. Under the action of the inclined plate 36, it will move towards the center of the rivet seat 8. During the initial placement process, the rivet 45 can be accurately placed in the designated position by the guidance of multiple inclined plates 36, so as to improve the accuracy of subsequent riveting.

[0048] When the rivet 45 deviates slightly during the first riveting process, it will press against the inclined plate 36 when it is placed into the second rivet seat 8 (at this time, the inclined plate 36 is pressed to fit against the auxiliary plate 38). When the second riveting is performed, the rivet 45 will move towards the center of the rivet seat 8 under the action of the inclined surface of the inclined plate 36. This is to guide and calibrate the rivet 45 that deviated during the initial riveting process, thereby further improving the accuracy of riveting.

[0049] When the bottom of the rivet 45 tilts, multiple lifting rods 37 support the bottom of the sheet metal workpiece 9 when it is placed above the rivet seat 8. When the riveting roller 3 performs the riveting operation on the sheet metal workpiece 9, the sheet metal workpiece 9 can move vertically downwards, preventing the sheet metal workpiece 9 from being in a state of being high on one side and low on the other due to the tilt of the bottom during the riveting operation. The lifting rods 37 provide multiple points of uniform support to the bottom of the sheet metal workpiece 9, forming a rigid support plane. Even if the bottom of the rivet 45 is initially tilted, the supporting force of the lifting rods 37 can force the workpiece to maintain a horizontal posture, ensuring that the workpiece moves vertically downwards during the riveting operation and avoiding the problem of being high on one side and low on the other due to tilt. In the multi-station continuous riveting process, if the tilt of the workpiece in the previous station is not corrected, the error in the subsequent station will be amplified due to the reference deviation. The supporting function of the lifting rods 37 recalibrates the vertical posture of the workpiece at each station, blocks the transmission of error, and ensures that the riveting accuracy of each station is consistent.

[0050] 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 sheet metal riveting device for processing magnesium alloy sheet metal brackets, characterized in that, include: A processing table (1) is provided with a driving mechanism (2) installed on the top of the processing table (1). Multiple riveting rollers (3) are installed on the execution end of the driving mechanism (2). A rectangular table (4) is installed on the top of the processing table (1). A placement frame (7) and three rivet seats (8) are fixedly connected to the top of the rectangular table (4). A conveying mechanism, a segmented riveting unit and a guide assembly are respectively provided on the top of the rectangular table (4). An automatic rivet feeder is installed on the outer wall of the leftmost rivet seat (8). The rivet (45) is conveyed to the top of the leftmost rivet seat (8) by the automatic rivet feeder. A sheet metal workpiece (9) is placed on the top of the placement frame (7). The sheet metal workpiece (9) placed on the top of the placement frame (7) is conveyed to the three rivet seats (8) in sequence by the conveying mechanism, so that the sheet metal workpiece (9) and the rivet (45) placed on the top of the leftmost rivet seat (8) can start riveting. The conveying mechanism includes a motor (13) fixedly connected to one side of the rectangular platform (4). The execution end of the motor (13) is fixedly connected to a first pulley (15). The top of the rectangular platform (4) is fixedly connected to two fixed seats (12), and the two fixed seats (12) are symmetrically arranged about the center of the rectangular platform (4). A connecting rod (14) is rotatably connected to the inner side of each of the two fixed seats (12). Both ends of the connecting rod (14) pass through to the outside of the fixed seat (12) and are fixedly connected to a sprocket (18). A second pulley (17) is fixedly connected to the outer wall of one of the connecting rods (14). A belt (16) is installed on the outer wall of the first pulley (15) and the second pulley (17). A chain (11) is installed on the outer wall of each pair of sprockets (18). The conveying mechanism also includes multiple sets of fixing frames (21) fixedly connected to the outer walls of the two chains (11). Each set of fixing frames (21) has two members, and the two fixing frames (21) are fixed to both sides of one chain (11). A connecting plate (22) is fixedly connected to the top of each pair of fixing frames (21). A first support plate (23) is provided on one side of the connecting plate (22). A second support plate (32) is fixedly connected to one side of the first support plate (23) through a rectangular connecting rod (31). A support rod (5) is fixedly connected to the top of the rectangular platform (4) and the processing platform (1). A feeding channel (6) is fixedly connected to the top of the support rod (5). The conveying mechanism also includes trapezoidal grooves (24) formed on the sidewalls of each of the first pallets (23). A trapezoidal slider (46) is slidably connected to the inner side of the trapezoidal groove (24). A first spring (25) is installed between the trapezoidal slider (46) and the trapezoidal groove (24). One side of the trapezoidal slider (46) is fixedly connected to the end of the connecting plate (22). A second spherical rod (33) is fixedly connected to the bottom of the first pallet (23). The top of the rectangular platform (4) Two sets of fixing plates (10) are fixedly connected. Each set of fixing plates (10) is provided with multiple plates. Each fixing plate (10) has a trapezoidal block (19) fixedly connected to its top, which abuts against the second ball rod (33). Each set of fixing plates (10) has a limiting plate (20) fixedly connected to one side, and the limiting plate (20) abuts against the bottom of the chain (11). The inner side of the first support plate (23) is provided with an auxiliary component for clamping the sheet metal workpiece (9). The auxiliary components include two clamping plates (34) disposed on the inner side of each of the first pallets (23). A first spherical rod (28) is fixedly connected to one side of each of the two clamping plates (34). One end of the first spherical rod (28) extends through to the outside of the first pallet (23) and is slidably connected to the first pallet (23). A circular plate (29) is fixedly connected to the outer wall of the first spherical rod (28). A second spring (30) is installed between the circular plate (29) and the first pallet (23). A columnar connecting rod (26) is fixedly connected to both sides of the connecting plate (22). One end of each of the two columnar connecting rods (26) is fixedly connected to an abutment block (27) that abuts against the first spherical rod (28). The segmented riveting unit includes an abutment groove (44) formed inside each of the riveting seats (8), the depth of which decreases from left to right; The guide assembly includes multiple cylindrical slide grooves (39) that are all opened inside the two of the rivet seats (8). A lifting rod (37) is slidably connected to the inner side of each of the two cylindrical slide grooves (39). Two auxiliary blocks (40) are fixedly connected to the outer wall of the lifting rod (37). A moving groove matching the auxiliary block (40) is opened on the inner side of each of the two cylindrical slide grooves (39). The auxiliary block (40) is slidably connected to the cylindrical slide groove (39) through the moving groove. A third spring (41) is installed between each lifting rod (37) and one of the cylindrical slide grooves (39).

2. The sheet metal riveting device for processing magnesium alloy sheet metal brackets according to claim 1, characterized in that, The guide assembly also includes a plurality of auxiliary seats (35) that are fixedly connected to the inner sides of the two abutment grooves (44). Each auxiliary seat (35) has an inclined plate (36) rotatably connected to its inner side via a pivot. The ends of the plurality of inclined plates (36) are arc-shaped and the diameter of the arc matches the diameter of the rivet (45).

3. The sheet metal riveting device for processing magnesium alloy sheet metal brackets according to claim 2, characterized in that, The guide assembly also includes an auxiliary plate (38) fixedly connected to the inner side of the abutment groove (44). The inner side of the auxiliary plate (38) is provided with a plurality of arc grooves (42), and an arc spring (43) is installed between each of the inclined plates (36) and an arc groove (42).

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