Metal plate riveting device for magnesium alloy metal plate support machining

Abstract

The invention discloses a sheet metal press riveting device for magnesium alloy sheet metal support machining, and relates to the technical field of sheet metal machining equipment.The sheet metal press riveting device comprises a machining table, a driving mechanism is installed at the top of the machining table, a plurality of press riveting rollers are installed at the execution end of the driving mechanism, and a rectangular table is installed at the top of the machining table; the top of the rectangular table is fixedly connected with a containing frame and three riveting bases. Through cooperation of the three riveting bases and other parts, a metal plate workpiece is preliminarily pressed into the abutting groove with the deepest depth on the left side, the deformation amount is large, but the final depth is not reached, and then the metal plate workpiece is further compressed into the abutting groove in the middle to deform for the second time; and finally, final forming of the rivet is completed through the abutting groove with the final depth on the right side, the mode that rough machining is conducted firstly, and then finish machining is conducted is adopted, so that cracking or tearing of the metal plate workpiece caused by stress concentration due to one-time excessive deformation is avoided, and therefore the riveting precision of the metal plate workpiece and the yield after riveting are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal processing equipment, and particularly to a sheet metal riveting device for processing magnesium alloy sheet metal brackets. Background Art

[0002] Magnesium alloy is an alloy composed of magnesium as the base and other elements added. Its characteristics are: low density, high strength, large elastic modulus, good heat dissipation, good shock absorption, greater ability to withstand impact loads than aluminum alloy, and good corrosion resistance to organic substances and alkalis. The main alloying elements are aluminum, zinc, manganese, cerium, thorium, and a small amount of zirconium or cadmium, etc. The most widely used is magnesium-aluminum alloy, followed by magnesium-manganese alloy and magnesium-zinc-zirconium alloy. It is mainly used in industrial sectors such as aviation, aerospace, transportation, chemical industry, and rockets. When riveting a magnesium alloy sheet metal bracket, a sheet metal riveting device is required.

[0003] In the prior art, when riveting a magnesium alloy sheet metal bracket, it is necessary for workers to place it at a designated position manually, then the automatic feeding mechanism conveys the rivets to the bracket, and finally the riveting device completes the riveting operation. However, during this process, when using a one-time formed rivet for riveting, due to sudden changes in local stress, defects such as cracking at the edge of the riveting hole and scratches on the sheet metal surface are likely to occur. The appearance of these defects will significantly reduce the quality stability of the riveting process, resulting in a decrease in the qualified rate of finished products and also having an adverse impact on production efficiency. Therefore, we provide a sheet metal riveting device for processing magnesium alloy sheet metal brackets to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a sheet metal riveting device for processing magnesium alloy sheet metal brackets to solve the problem that in the process of riveting a magnesium alloy sheet metal bracket, a one-time formed rivet is prone to cracking at the edge of the riveting hole and scratches on the sheet metal surface due to sudden changes in local stress, thereby reducing the quality stability, qualified rate of finished products, and production efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions: A sheet metal riveting device for processing a magnesium alloy sheet metal bracket, comprising: a processing table, a driving mechanism is installed on the top of the processing table, a plurality of riveting rollers are installed at the execution end of the driving mechanism, a rectangular table is installed on the top of the processing table, a placing rack and three riveting seats are fixedly connected to the top of the rectangular table, and a rivet is provided on the top of each of the placing rack and the three riveting seats. A sheet metal workpiece is provided on the top of the rivet. A conveying mechanism, a segmented riveting unit and a guiding component are respectively arranged on the top of the rectangular table; The conveying mechanism includes a motor fixedly connected to one side of the rectangular table, a first pulley is fixedly connected to the execution end of the motor, two fixed seats are fixedly connected to the top of the rectangular table, and the two fixed seats are symmetrically arranged with the center of the rectangular table as the axis of symmetry. A connecting rod is rotatably connected to the inner side of each of the two fixed seats, and a sprocket is fixedly connected to each end of the connecting rod and penetrates to 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 walls of the first pulley and the second pulley, and a chain is installed on the outer walls of every two sprockets.

[0006] As a further solution of the present invention: The conveying mechanism further includes a plurality of groups of fixing frames respectively fixedly connected to the outer walls of the two chains. Each group of fixing frames has two, and the two fixing frames are respectively fixed on both sides of one chain. A connecting plate is fixedly connected to the top of every two fixing frames. A first supporting plate is arranged on one side of the connecting plate. A second supporting plate is fixedly connected to one side of the first supporting plate through a rectangular connecting rod. A supporting rod is fixedly connected to the tops of the rectangular table and the processing table respectively, and a blanking channel is fixedly connected to the top of the supporting rod.

[0007] As a further solution of the present invention: The conveying mechanism further includes trapezoidal chutes respectively opened on the side walls of each of the first supporting plates. A trapezoidal slider is slidably connected to the inside of the trapezoidal chute. A first spring is installed between the trapezoidal slider and the trapezoidal chute. One side of the trapezoidal slider is fixedly connected to the end of the connecting plate. A second spherical rod is fixedly connected to the bottom of the first supporting plate. Two groups of fixing plates are fixedly connected to the top of the rectangular table. Each group of fixing plates has a plurality of them, and a trapezoidal block that abuts against the second spherical rod is fixedly connected to the top of each fixing plate. A limiting plate is fixedly connected to one side of each group of fixing plates, and the limiting plate abuts against the bottom of the chain. An auxiliary component for clamping the sheet metal workpiece is arranged inside the first supporting plate.

[0008] As a further solution of the present invention: The auxiliary component includes two clamping plates both arranged inside each of the first pallets. One first spherical rod is fixedly connected to one side of each of the two clamping plates. One end of the first spherical rod penetrates 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. One cylindrical connecting rod is fixedly connected to each side of the connecting plate. One abutting block that abuts against the first spherical rod is fixedly connected to one end of each of the two cylindrical connecting rods.

[0009] As a further solution of the present invention: The segmented riveting unit includes abutting grooves opened inside each of the riveting seats, and the depth of the abutting grooves decreases from left to right.

[0010] As a further solution of the present invention: The guiding component includes a plurality of cylindrical sliding grooves opened inside two of the riveting seats. One lifting rod is slidably connected to the inside of each of the two cylindrical sliding grooves. Two auxiliary blocks are fixedly connected to the outer wall of the lifting rod. And moving grooves matching the auxiliary blocks are opened inside each of the two cylindrical sliding grooves. The auxiliary blocks are slidably connected to the cylindrical sliding grooves through the moving grooves. A third spring is installed between each lifting rod and one of the cylindrical sliding grooves.

[0011] As a further solution of the present invention: The guiding component further includes a plurality of auxiliary seats fixedly connected to the inside of two of the abutting grooves. One inclined plate is rotatably connected to the inside of each auxiliary seat through a rotating shaft. The end shapes of the plurality of inclined plates are arc-shaped, and the arc diameter matches the diameter of the rivet.

[0012] As a further solution of the present invention: The guiding component further includes an auxiliary plate fixedly connected to the inside of the abutting groove. A plurality of arc-shaped grooves are opened inside the auxiliary plate. An arc-shaped spring is installed between each inclined plate 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 the cooperation of three riveting seats and other parts, since the depths of the abutting grooves inside the three riveting seats decrease successively from left to right, the sheet metal workpiece can first be preliminarily pressed into the leftmost abutting groove with the deepest depth, with a relatively large initial deformation but not reaching the final depth. Subsequently, it is further compressed through the middle abutting groove with a smaller deformation amount. Finally, the final forming of the rivet is completed through the rightmost abutting groove with the final depth. The left abutting groove has the deepest depth and the largest initial deformation amount, enabling the sheet metal to be initially embedded into the rivet to a large extent at the beginning of riveting, but not reaching the final shape. This way of rough machining first and then finishing machining avoids the cracking or tearing of the sheet metal workpiece due to stress concentration caused by excessive deformation at one time, thus improving the accuracy of riveting the sheet metal workpiece and the yield rate after riveting;

[0015] 2. By setting the cooperation of parts such as a chain, through the mutual cooperation of the chain with the first support plate and the second support plate, the sheet metal workpiece can be successively placed from the placement rack onto the riveting seat that needs to be riveted for the first time continuously. At the same time, the sheet metal workpiece completed the first riveting is placed onto the riveting seat that needs to be riveted for the second time, and the sheet metal workpiece completed the second riveting is placed onto the riveting seat that needs to be riveted for the third time. The sheet metal workpiece completed the third riveting is automatically unloaded, so that the device can perform continuous riveting operations, thereby improving the efficiency of riveting and further improving the processing efficiency of the workpiece;

[0016] 3. By setting the cooperation of parts such as clamping plates, when the first support plate moves upward a certain distance, the first support plate drives two first spherical rods to respectively abut against the inclined surfaces of a contact block. When the second spherical rod moves to near the highest point of the trapezoidal block, the first spherical rod contacts from the lowest point of the inclined surface of the contact block. When the second spherical rod continues to move upward, at this time, the contact block pushes the first spherical rod, and the first spherical rod drives two clamping plates to clamp both sides of the sheet metal workpiece. When the second spherical rod separates from the inclined surface on one side of the trapezoidal block, the two clamping plates clamp both sides of the sheet metal workpiece, ensuring the position of the sheet metal workpiece on the riveting seat or the support plate is fixed, and avoiding the deviation of the riveting position caused by shaking or offset during the conveying process. Especially in multi-station continuous operation, accurate positioning can ensure the consistency of the riveting quality of each station;

[0017] 4. By setting the cooperation of parts such as an inclined plate, when the rivet undergoes slight deformation during the first riveting operation inside the first abutting groove, and when the sheet metal workpiece moves to the inside of the second riveting seat and the rivet contacts the inclined plate, the sheet metal workpiece will cause the bottom of the rivet to contact the inclined plate due to its own gravity. Under the action of the inclined plate, it moves towards the center position of the riveting seat. When the rivet is initially placed, through the guiding effect of multiple inclined plates, the rivet can be accurately placed at the specified position, so as to improve the accuracy of subsequent riveting;

[0018] 5. By setting the cooperation of parts such as the inclined plate, when the rivet has a slight deviation during the first riveting process, the rivet after the first riveting will abut against the inclined plate when it is placed on the second riveting seat. When the secondary riveting is carried out, the rivet will move towards the center position of the riveting seat under the action of the inclined surface of the inclined plate, so as to conduct a guiding and calibration operation on the rivet with deviation during the primary riveting during the secondary riveting process, thereby further improving the accuracy of riveting;

[0019] 6. By setting the cooperation of parts such as the lifting rod, when the bottom of the rivet is inclined, when the sheet metal workpiece is placed above the riveting seat, the bottom of the sheet metal workpiece is supported by multiple lifting rods. When the riveting roller performs the riveting work on the sheet metal workpiece, the sheet metal workpiece can move vertically downward, preventing the sheet metal workpiece from being in a state of one side being high and the other side being low when the riveting work is carried out due to the inclination of the bottom. The lifting rods provide multi-point uniform support for the bottom of the sheet metal workpiece, forming a rigid support plane. Even if the bottom of the rivet is initially inclined, the supporting force of the lifting rods can force the workpiece to maintain a horizontal posture, ensuring that the workpiece moves vertically downward during riveting and avoiding the problem of one side being high and the other side being low caused by inclination. In the multi-station continuous riveting process, if the workpiece is inclined in the previous station and not corrected, the subsequent station will have an error amplification due to the reference deviation. The supporting function of the lifting rods recalibrates the vertical posture of the workpiece at each station, blocking the error transmission and ensuring the same riveting accuracy at each station. Brief Description of the Drawings

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

[0021] Figure 2 is a structural schematic diagram of the top of the rectangular table of the present invention;

[0022] Figure 3 of the present invention Figure 2 is an enlarged view at A in;

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

[0024] Figure 5 is a structural schematic diagram of the fixing bracket of the present invention;

[0025] Figure 6 of the present invention Figure 5 is an enlarged view at B in;

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

[0027] Figure 8 is a structural schematic diagram of the riveting seat of the present invention;

[0028] Figure 9 is a cross-sectional view of the riveting seat of the present invention;

[0029] Figure 10 For the present invention Figure 9 Magnified view at position C in the present invention;

[0030] Figure 11 Cross-sectional views of three riveting seats of the present invention.

[0031] In the figure: 1, processing table; 2, driving mechanism; 3, riveting roller; 4, rectangular table; 5, support rod; 6, blanking channel; 7, placement rack; 8, riveting seat; 9, sheet metal workpiece; 10, fixing plate; 11, chain; 12, fixed 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 chute; 25, first spring; 26, cylindrical connecting rod; 27, abutting 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 chute; 40, auxiliary block; 41, third spring; 42, arc groove; 43, arc spring; 44, abutting groove; 45, rivet; 46, trapezoidal slider. Specific embodiments

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The embodiments of the present invention will be described below according to its overall structure.

[0034] Please refer to Figures 1 to 11, this embodiment provides a sheet metal riveting device for processing a magnesium alloy sheet metal bracket, including: a processing table 1, a driving mechanism 2 is installed on the top of the processing table 1, a plurality of riveting rollers 3 are installed at the execution end of the driving mechanism 2, a rectangular table 4 is installed on the top of the processing table 1, a placement rack 7 and three riveting seats 8 are fixedly connected to the top of the rectangular table 4, and a rivet 45 is arranged on the top of each of the placement rack 7 and the three riveting seats 8. A sheet metal workpiece 9 is arranged on the top of the rivet 45. A conveying mechanism, a segmented riveting unit and a guiding component are respectively arranged on the top of the rectangular table 4;The conveying mechanism includes a motor 13 fixedly connected to one side of a rectangular table 4. The execution end of the motor 13 is fixedly connected with a first pulley 15. Two fixed seats 12 are fixedly connected to the top of the rectangular table 4, and the two fixed seats 12 are symmetrically arranged with the center of the rectangular table 4 as the axis of symmetry. 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 respectively penetrate to the outside of the fixed seat 12 and are fixedly connected with 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 walls of the first pulley 15 and the second pulley 17. A chain 11 is installed on the outer walls of every two sprockets 18. The conveying mechanism further includes multiple groups of fixing frames 21 respectively fixedly connected to the outer walls of the two chains 11. Each group of fixing frames 21 has two, and the two fixing frames 21 are respectively fixed on both sides of a chain 11. A connecting plate 22 is fixedly connected to the top of every two fixing frames 21. A first support plate 23 is arranged on one side of the connecting plate 22. One side of the first support plate 23 is fixedly connected with a second support plate 32 through a rectangular connecting rod 31. A support rod 5 is respectively fixedly connected to the tops of the rectangular table 4 and the processing table 1. A blanking channel 6 is fixedly connected to the top of the support rod 5. The conveying mechanism further includes trapezoidal chutes 24 respectively opened on the side walls of each first support plate 23. A trapezoidal slider 46 is slidably connected to the inside of the trapezoidal chute 24. A first spring 25 is installed between the trapezoidal slider 46 and the trapezoidal chute 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 groups of fixing plates 10 are fixedly connected to the top of the rectangular table 4. Each group of fixing plates 10 has multiple, and a trapezoidal block 19 abutted against the second spherical rod 33 is fixedly connected to the top of each fixing plate 10. A limiting plate 20 is fixedly connected to one side of each group of fixing plates 10, and the limiting plate 20 abuts against the bottom of the chain 11. An auxiliary assembly for clamping the sheet metal workpiece 9 is arranged inside the first support plate 23. The auxiliary assembly includes two clamping plates 34 respectively arranged inside each first support plate 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 penetrates 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 cylindrical connecting rod 26 is fixedly connected to both sides of the connecting plate 22. One end of each of the two cylindrical connecting rods 26 is fixedly connected with an abutting block 27 abutted against the first spherical rod 28;

[0035] The driving mechanism 2 is composed of structures such as fixing frames, multiple cylinders and control elements. Since how to perform riveting operations is existing, this solution does not elaborate too much;

[0036] The rivet automatic feeder is installed on the outer wall of the leftmost riveting seat 8. Thus, the device intermittently conveys the rivets 45 to the top of the riveting seat 8. Since how the rivet automatic feeder operates is prior art, it will not be elaborated here.

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

[0038] When riveting of the sheet metal workpiece 9 is required, first place the sheet metal workpiece 9 on the 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 drive multiple fixing brackets 21 on the outer wall of the chain 11 to move synchronously, thereby driving the first support plate 23 to move synchronously through the fixing bracket 21. After the first support plate 23 moves a certain distance, at this time, 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 abuts against the inclined surface of the trapezoidal block 19, then the first support plate 23 continues to move horizontally. When the second spherical 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 is pushed by the second spherical rod 33, so that the first support plate 23 moves upward along the trapezoidal block 46 through the trapezoidal chute 24, thereby enabling the first support plate 23 to drive the second support plate 32 to lift the sheet metal workpiece 9 on the top of the placement rack 7 through the rectangular connecting rod 31 and drive the sheet metal workpiece 9 to move towards the first riveting seat 8. When the second spherical rod 33 moves from the highest point to the lowest point of the trapezoidal block 19, it drives the first support plate 23 to move downward under the action of the first spring 25 and drives the sheet metal workpiece 9 through the first support plate 23 to place it above the leftmost riveting seat 8.

[0039] After the first press riveting is completed, continue to start the motor 13 and repeat the above operations to convey 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 abutting groove 44. When the rivet 45 is lifted out of the inside of the riveting seat 8, since the rivet 45 is stuck inside the riveting seat 8, at this time, the first support plate 23 can slide under the sheet metal workpiece 9. When the rivet 45 is lifted out of the inside of the riveting seat 8, at this time, 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.) At the same time, multiple groups of first support plates 23 can simultaneously convey the sheet metal workpieces 9 on the placement rack 7 and the three riveting seats 8, and convey the sheet metal workpieces 9 from left to right from the placement rack 7 to the three riveting seats 8 in sequence. When the sheet metal workpiece 9 is conveyed above the last riveting seat 8, at this time, the first support plate 23 continues to drag the sheet metal workpiece 9 forward. When turning at the chain 11, the first support plate 23 will rotate clockwise by a moving angle and convey the sheet metal workpiece 9 onto the blanking channel 6, and then perform blanking operations from the blanking channel 6, so that the device can perform continuous press riveting operations, thereby improving the efficiency of press riveting and further improving the processing efficiency of workpieces;

[0040] While the chain 11 is driving and the first support plate 23 drives the sheet metal workpiece 9 to move, the limiting plate 20 supports the chain 11 below the chain 11 to prevent the position of the sheet metal workpiece 9 from being inaccurate due to the sinking of the chain 11 when the first support plate 23 conveys the sheet metal workpiece 9. The limiting plate 20 provides continuous support below the chain 11 to force the chain 11 to maintain a horizontal straight motion trajectory, avoiding the decrease in the height of the support plate caused by the sinking of the chain 11, thereby ensuring the vertical height accuracy of the sheet metal workpiece 9 finally placed on the riveting seat 8, improving the accuracy during the conveying of the device, and further improving the applicability of the device;

[0041] When the first support plate 23 moves up a certain distance, the first support plate 23 drives the two first spherical rods 28 to abut against the inclined surfaces of a contact block 27 respectively. When the second spherical rod 33 moves close to the highest point of the trapezoidal block 19, the first spherical rod 28 contacts from the lowest point of the inclined surface of the contact block 27. When the second spherical rod 33 continues to move up, at this time, the contact block 27 pushes the first spherical rod 28, and the two clamping plates 34 are driven by the first spherical rod 28 to clamp both sides of the sheet metal workpiece 9. When the second spherical rod 33 separates from the inclined surface on one side of the trapezoidal block 19, the two clamping plates 34 clamp both sides of the sheet metal workpiece 9 to ensure the position of the sheet metal workpiece 9 is fixed on the riveting seat 8 or the support plate, avoiding deviation of the press riveting position caused by shaking or offset during the conveying process. Especially in multi-station continuous operations, accurate positioning can ensure the consistency of the press riveting quality at each station;

[0042] After the first riveting is completed, when the first pallet 23 lifts the sheet metal workpiece 9, the clamping plate 34 has not yet contacted the sheet metal workpiece 9. Because the movement trajectory of the first pallet 23 when it lifts is obliquely upward, and the rivet 45 needs to be lifted vertically upward to completely separate from the riveting seat 8. At this time, when the first pallet 23 lifts the sheet metal workpiece 9 and continues to move, the sheet metal workpiece 9 will displace a certain distance on the first pallet 23, so that the rivet 45 can completely separate from the riveting seat 8. Then, when the first pallet 23 moves to the highest point of the trapezoidal block 19, the sheet metal workpiece 9 is clamped by the two clamping plates 34, thereby preventing the bottom of the sheet metal workpiece 9 from being damaged when the first pallet 23 lifts the sheet metal workpiece 9 and not being completely separated from the riveting seat 8, and further improving the applicability of the equipment during processing.

[0043] Please refer to Figure 3 and Figure 11 , the segmented riveting unit includes a butt joint groove 44 opened inside each riveting seat 8, and the depth of the butt joint groove 44 decreases from left to right;

[0044] The depth of the butt joint groove 44 on the inner side of the rightmost riveting seat 8 matches the depth of the butt joint groove 44 on the inner side of the existing standard riveting seat 8;

[0045] Since the depths of the butt joint grooves 44 inside the three riveting seats 8 decrease in sequence from left to right, the sheet metal workpiece 9 can first pass through the butt joint groove 44 with the deepest depth on the left for preliminary pressing and deformation with a relatively large amount but not reaching the final depth. Subsequently, it passes through the butt joint groove 44 in the middle for further compression with a smaller deformation amount; finally, the final forming of the rivet 45 is completed through the butt joint groove 44 with the final depth on the right. The depth of the butt joint groove 44 on the left is the deepest and the initial deformation amount is the largest, enabling the sheet metal to be initially embedded into the rivet 45 with a large amplitude at the initial stage of riveting, but not reaching the final shape. This way of rough machining first and then fine machining avoids the sheet metal workpiece 9 from cracking or tearing due to stress concentration caused by excessive deformation at one time, thereby improving the accuracy of riveting of the sheet metal workpiece 9 and the yield rate after riveting.

[0046] Please refer to Figures 8 to 11, the guiding assembly includes a plurality of cylindrical sliding grooves 39 both opened inside two of the riveting seats 8. A lifting rod 37 is slidably connected to the inner sides of two of the cylindrical sliding grooves 39 respectively. Two auxiliary blocks 40 are fixedly connected to the outer wall of the lifting rod 37. Moving grooves matching the auxiliary blocks 40 are opened on the inner sides of two of the cylindrical sliding grooves 39 respectively. The auxiliary blocks 40 are slidably connected to the cylindrical sliding grooves 39 through the moving grooves. A third spring 41 is installed between each lifting rod 37 and one of the cylindrical sliding grooves 39 respectively. The guiding assembly further includes a plurality of auxiliary seats 35 fixedly connected to the inner sides of two of the abutting grooves 44 respectively. A sloping plate 36 is rotatably connected to the inner side of each auxiliary seat 35 through a rotating shaft. The end shapes of the plurality of sloping plates 36 are arc-shaped, and the arc diameter matches the diameter of the rivet 45. The guiding assembly further includes an auxiliary plate 38 fixedly connected to the inner side of the abutting groove 44. A plurality of arc-shaped grooves 42 are opened on the inner side of the auxiliary plate 38. An arc-shaped spring 43 is installed between each sloping plate 36 and one of the arc-shaped grooves 42 respectively;

[0047] When the rivet 45 is slightly deformed during the first riveting operation inside the first abutting groove 44, and when the rivet 45 contacts the sloping plate 36 during the process of moving the sheet metal workpiece 9 into the second riveting seat 8, after the bottom of the rivet 45 contacts the sloping plate 36 due to the self-weight of the sheet metal workpiece 9, the rivet 45 will move towards the center position of the riveting seat 8 under the action of the sloping plate 36. During the initial placement of the rivet 45, under the guiding effect of the plurality of sloping plates 36, the rivet 45 can be accurately placed at the designated position, so as to improve the accuracy of subsequent riveting;

[0048] When the rivet 45 is slightly offset during the first riveting process, when the rivet 45 after the first riveting is placed into the second riveting seat 8, the rivet 45 will abut against the sloping plate 36 (at this time, the sloping plate 36 is pressed against the auxiliary plate 38). When the secondary riveting is performed, the rivet 45 will move towards the center position of the riveting seat 8 under the action of the inclined surface of the sloping plate 36, so as to perform a guiding and calibration operation on the rivet 45 with offset during the preliminary riveting during the secondary riveting process, thereby further improving the accuracy of riveting;

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

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A sheet metal riveting device for processing a magnesium alloy sheet metal bracket, characterized in that, Including: A processing table (1), on the top of which a driving mechanism (2) is installed. The execution end of the driving mechanism (2) is installed with a plurality of riveting rollers (3). On the top of the processing table (1), a rectangular table (4) is installed. On the top of the rectangular table (4), a placing rack (7) and three riveting seats (8) are fixedly connected. And on the tops of the placing rack (7) and the three riveting seats (8), a rivet (45) is arranged respectively. On the top of the rivet (45), a sheet metal workpiece (9) is arranged. On the top of the rectangular table (4), a conveying mechanism, a segmented riveting unit and a guiding component are respectively arranged; The conveying mechanism includes a motor (13) fixedly connected to one side of the rectangular table (4). The execution end of the motor (13) is fixedly connected with a first pulley (15). On the top of the rectangular table (4), two fixing seats (12) are fixedly connected. And the two fixing seats (12) are symmetrically arranged with the center of the rectangular table (4) as the axis of symmetry. A connecting rod (14) is rotatably connected to the inner side of each of the two fixing seats (12). The two ends of the connecting rod (14) respectively penetrate to the outside of the fixing seat (12) and are fixedly connected with a sprocket (18). On the outer wall of one of the connecting rods (14), a second pulley (17) is fixedly connected. A belt (16) is installed on the outer walls of the first pulley (15) and the second pulley (17). A chain (11) is installed on the outer walls of every two sprockets (18).

2. The sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 1, characterized in that, The conveying mechanism further includes a plurality of groups of fixing frames (21) respectively fixedly connected to the outer walls of the two chains (11). Each group of the fixing frames (21) has two, and the two fixing frames (21) are respectively fixed on both sides of one of the chains (11). A connecting plate (22) is fixedly connected to the top of every two fixing frames (21). On one side of the connecting plate (22), a first supporting plate (23) is arranged. One side of the first supporting plate (23) is fixedly connected with a second supporting plate (32) through a rectangular connecting rod (31). A supporting rod (5) is respectively fixedly connected to the tops of the rectangular table (4) and the processing table (1). The top of the supporting rod (5) is fixedly connected with a blanking channel (6).

3. The sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 2, characterized in that, The conveying mechanism further includes trapezoidal chutes (24) which are all opened on the side walls of each first pallet (23). A trapezoidal slider (46) is slidably connected to the inner side of the trapezoidal chute (24). A first spring (25) is installed between the trapezoidal slider (46) and the trapezoidal chute (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). Two groups of fixing plates (10) are fixedly connected to the top of the rectangular table (4). Each group of fixing plates (10) has a plurality of them, and a trapezoidal block (19) which abuts against the second spherical rod (33) is fixedly connected to the top of each fixing plate (10). A limiting plate (20) is fixedly connected to one side of each group of fixing plates (10), and the limiting plate (20) abuts against the bottom of the chain (11). An auxiliary component for clamping the sheet metal workpiece (9) is arranged inside the first pallet (23).

4. The sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 3, wherein, The auxiliary component includes two clamping plates (34) which are all arranged inside each first pallet (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) penetrates 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 cylindrical connecting rod (26) is fixedly connected to both sides of the connecting plate (22). A butting block (27) which abuts against the first spherical rod (28) is fixedly connected to one end of each of the two cylindrical connecting rods (26).

5. A sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 4, characterized in that, The segmented riveting unit includes abutting grooves (44) which are opened inside each riveting seat (8). The depth of the abutting groove (44) decreases from left to right.

6. The sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 5, characterized in that, The guiding component includes a plurality of cylindrical chutes (39) which are all opened inside two of the riveting seats (8). A lifting rod (37) is slidably connected to the inner side of each of the two cylindrical chutes (39). Two auxiliary blocks (40) are fixedly connected to the outer wall of the lifting rod (37). And moving grooves which are matched with the auxiliary blocks (40) are opened inside each of the two cylindrical chutes (39). The auxiliary blocks (40) are slidably connected to the cylindrical chutes (39) through the moving grooves. A third spring (41) is installed between each lifting rod (37) and one of the cylindrical chutes (39).

7. A sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 6, wherein, The guiding component further includes a plurality of auxiliary seats (35) which are all fixedly connected to the inner sides of two of the abutting grooves (44). An inclined plate (36) is rotatably connected to the inner side of each auxiliary seat (35) through a rotating shaft. The ends of the plurality of inclined plates (36) are in an arc shape, and the arc diameter is matched with the diameter of the rivet (45).

8. A sheet metal riveting device for processing a magnesium alloy sheet metal bracket according to claim 7, characterized in that, The guiding component further includes an auxiliary plate (38) fixedly connected to the inner side of the abutting groove (44). A plurality of arc-shaped grooves (42) are formed in the inner side of the auxiliary plate (38). An arc-shaped spring (43) is installed between each inclined plate (36) and one of the arc-shaped grooves (42).

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