Adaptive positioning and riveting tooling based on lightweight stamping parts of power battery pack

Abstract

The present application relates to the technical field of stamping part riveting, and particularly relates to a self-adaptive positioning riveting tool for lightweight stamping parts of a power battery pack, which comprises a riveting table, a mechanical arm installed on the riveting table, a mounting rack installed on the mechanical arm, a grabbing mechanism for self-adaptive profiling and fitting of the stamping part, and a riveting mechanism for self-feeding of rivets, the grabbing mechanism comprises a seat body fixedly connected to the mounting rack, and the bottom of the seat body is provided with a plurality of movable pipes, the present application forms a multi-point profiling structure according to the surface morphology of the stamping part, realizes self-adaptive adsorption and grabbing, avoids the drawbacks of traditional rigid grabbing, guarantees the stability of grabbing, and can also construct a distributed support network on the surface of the stamping part to balance local stress, so as to further stabilize the overall anti-deformation capability of the stamping part during riveting, thereby improving the riveting quality.

Description

Technical Field

[0001] This invention relates to the field of stamping riveting technology, and in particular to an adaptive positioning riveting fixture for lightweight stamping parts based on power battery packs. Background Technology

[0002] As a core structural component of the power battery system of new energy vehicles, lightweight stamped parts of power battery packs are precision metal components made of lightweight materials and processed by stamping. They are widely used in key parts such as battery pack shells, frames, support structures and protective components. Their core value lies in minimizing the overall weight of the battery pack while meeting structural strength and protection performance requirements, and achieving a balance between assembly accuracy and production efficiency.

[0003] Traditional riveting fixtures for lightweight stamped parts generally use side clamping or multi-side clamping to achieve precise positioning and riveting. However, when dealing with stamped parts with irregular surface features, the following problems exist:

[0004] Small-area loose clamping leads to insufficient positioning stability, making it impossible to guarantee positional accuracy during riveting. Over-pressure clamping can cause plastic deformation of thin-walled parts, directly affecting the performance of the parts. Although this problem can be solved by using contour clamping blocks, contour clamping blocks are used individually for corresponding parts and cannot achieve universal processing for different stamped parts, thus causing inconvenience in use.

[0005] To address the aforementioned technical deficiencies, a solution is proposed that autonomously forms a conformal structure around the riveting point based on the surface morphology of the stamped part, thereby improving the positioning and fixing effect and solving the problems of ineffective clamping and overpressure in traditional clamping. Furthermore, a distributed support network is constructed through adsorption and gripping to balance local stress, effectively enhancing the overall deformation resistance of the stamped part. This simultaneously improves the riveting quality from both positioning stability and structural protection perspectives, thus balancing the needs of generalization with the requirements of precision assembly. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive positioning and riveting fixture for lightweight stamped parts of power battery packs, in order to solve the aforementioned technical defects.

[0007] The objective of this invention can be achieved through the following technical solution: a lightweight stamping part adaptive positioning riveting fixture based on a power battery pack, including a riveting table and a robotic arm mounted on the riveting table. The robotic arm is equipped with a mounting frame, and the mounting frame is provided with a gripping mechanism for adaptive conformal fitting of the stamping part and a riveting mechanism for self-feeding rivets. The gripping mechanism includes a base fixedly connected to the mounting frame. The bottom of the base is provided with several movable tubes, and an adsorption tube with a sealed top is movably installed inside the movable tubes. The bottom of the adsorption tube is connected to a suction cup.

[0008] Preferably, the seat body has an internal cavity and an installation cavity located below the cavity. A piston cavity communicating with the cavity is provided on one side of the installation cavity. The movable tube is slidably connected to the seat body, and a first spring is fixedly connected between the top of the movable tube and the cavity.

[0009] Preferably, a locking plate is slidably connected inside the mounting cavity, and the locking plate has a through groove for the corresponding movable tube to pass through. An anti-slip pad is installed on one inner wall of the through groove, and a piston plate is fixedly connected to the locking plate and slidably connected to the piston cavity.

[0010] Preferably, the adsorption tube is rotatably connected to a sealing sleeve that is slidably connected to the movable tube, and the sealing sleeve and the adsorption tube are damped to rotate. The inner wall of the sealing sleeve is provided with an air groove that extends through its top, and the adsorption tube is provided with a slot that mates with the air groove.

[0011] Preferably, a second spring is fixedly connected between the top of the sealing sleeve and the cavity, guide pins are symmetrically fixed on the outer walls of both sides of the sealing sleeve, and an oblique groove is provided on the inner wall of the movable tube to slide and connect with the guide pins.

[0012] Preferably, an air cylinder communicating with the cavity is fixedly installed on one side of the top of the seat, and a piston block is slidably connected inside the air cylinder. An electric push rod for driving the piston block to slide is installed on the mounting bracket.

[0013] Preferably, a rivet hole is provided in the middle of the base, a guide pin sleeve is installed at the top of the rivet hole, and a plurality of elastic sheets are fixedly connected to the bottom of the guide pin sleeve to abut against the inner wall of the rivet hole. The elastic sheets are L-shaped.

[0014] Preferably, the riveting mechanism includes a hydraulic cylinder fixedly mounted on a mounting frame, a riveting rod being mounted on the piston rod end of the hydraulic cylinder via a connecting plate, and a rivet feeding rail for feeding rivets being slidably connected to the mounting frame.

[0015] Preferably, a linkage frame is fixedly connected to the top of the nail feeding rail, and a Z-shaped groove is provided on the linkage frame. A guide rod that is slidably connected to the Z-shaped groove is fixedly connected to the connecting plate. A limiting plate that is slidably connected to the rail groove of the nail feeding rail is fixedly connected to the top of the base. A nail feeding tube is installed on one side of the top of the nail feeding rail.

[0016] The beneficial effects of this invention are as follows:

[0017] (1) This invention uses multiple adsorption tubes and corresponding movable tubes to autonomously construct a multi-point conformal structure that combines passive conformal and active fitting according to the shape of each area on the surface of the lightweight internal support stamping part. This enables adaptive adsorption and gripping of the surface around different rivet points, avoiding the problem of small-area false clamping or overpressure deformation caused by irregular surface in traditional rigid gripping. During the adsorption process, the locking plate can move synchronously to lock the displacement of the movable tube after conformal adsorption, which helps to stabilize the position after gripping. It can also provide multi-point equal force support around different rivet points, construct a distributed support network, achieve adaptive balance of local stress, avoid the problem of uneven stress distribution and deformation caused by concentrated force on the rivet points during riveting, and help improve the riveting quality.

[0018] (2) During the descent of the rivet rod of the present invention, the feed rail moves in conjunction with the limiting plate, and moves within the feed rail to realize the automatic feeding of rivets into the rivet hole. Then, multiple L-shaped elastic plates are used to realize the self-centering of the rivets, thereby achieving precise riveting. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings;

[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 installation of multiple active tubes of the present invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of the gripping mechanism of the present invention;

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

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

[0025] Figure 6 This is a schematic diagram of the locking plate of the present invention;

[0026] Figure 7 This is a schematic diagram of the cooperation between the nail feeding rail and the nail guide sleeve of the present invention;

[0027] Figure 8 This is a schematic diagram showing the combination of the active tube and the adsorption tube of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the active tube of the present invention;

[0029] Figure 10 This is a schematic diagram of the sealing sleeve of the present invention;

[0030] Figure 11 This is a schematic diagram of the fit between the sealing sleeve and the adsorption tube of the present invention.

[0031] Legend:

[0032] 1. Riveting table; 11. Robotic arm; 12. Mounting frame;

[0033] 2. Seat; 21. Movable tube; 22. Adsorption tube; 23. Cavity; 24. Mounting cavity; 25. Piston cavity; 26. First spring; 27. Locking plate; 28. Piston plate; 29. ​​Sealing sleeve; 210. Air groove; 211. Groove opening; 212. Second spring; 213. Guide pin; 214. Angled groove; 215. Air cylinder; 216. Piston block; 217. Electric push rod;

[0034] 3. Guide pin sleeve; 31. Elastic sheet;

[0035] 4. Hydraulic cylinder; 41. Connecting plate; 42. Riveting rod; 43. Nail feeding rail; 44. Linkage frame; 45. Z-groove; 46. Guide rod; 47. Limiting plate. Detailed Implementation

[0036] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1 and Figure 8 As shown, the traditional clamping and riveting method cannot avoid the problems of loose clamping and overpressure, while also addressing the issue of universal processing for different stamped parts. The following solutions can be used to solve these problems.

[0038] The adaptive positioning and riveting fixture for lightweight stamped parts of power battery packs in this embodiment includes a riveting table 1 for placing lightweight shell stamped parts, and a robotic arm 11 mounted on the riveting table 1. The robotic arm 11 is equipped with a mounting frame 12, and the mounting frame 12 is provided with a gripping mechanism for adaptive conformal fitting of the stamped parts and a riveting mechanism for self-feeding rivets. The robotic arm 11 is used to realize the multi-degree-of-freedom movement of the mounting frame 12, thereby realizing the gripping, conveying and positioning installation of lightweight inner support stamped parts.

[0039] The gripping mechanism includes a base 2 fixedly connected to the mounting frame 12. The bottom of the base 2 is provided with several movable tubes 21, and an adsorption tube 22 with a sealed top is movably installed inside the movable tube 21. Through the arrangement of multiple adsorption tubes 22 and corresponding movable tubes 21, a multi-point conformal structure combining passive conformal and active fitting can be autonomously constructed according to the shape of each area on the surface of the lightweight inner support stamping part. This enables adaptive adsorption gripping of the surface around different riveting points, avoiding the problem of small-area false clamping or overpressure deformation caused by irregular surface in traditional rigid gripping. The bottom of the adsorption tube 22 is connected to a suction cup to achieve the sealing between the adsorption tube 22 and the lightweight inner support stamping part.

[0040] The seat 2 has an internal cavity 23 and an installation cavity 24 located below the cavity 23. A piston cavity 25 communicating with the cavity 23 is provided on one side of the installation cavity 24. The movable tube 21 is slidably connected to the seat 2. By extracting the air in the cavity 23, the gas in the adsorption tubes 22 inside the multiple movable tubes 21 is simultaneously extracted, so as to realize the synchronous adsorption and fixation treatment of each contact point of the lightweight inner support stamping part.

[0041] Furthermore, it promotes equal adsorption forces to construct a distributed support network to balance local stress, effectively enhancing the overall deformation resistance of the stamped parts. It simultaneously improves riveting quality from both positioning stability and structural protection aspects, taking into account both generalization requirements and precision assembly requirements. In addition, a first spring 26 is fixedly connected between the top of the movable tube 21 and the cavity 23. The first spring 26 is used for the independent movement of multiple movable tubes 21, so that the ends of the adsorption tubes 22 can generate a distance difference between each other, thereby achieving the effect of multi-point contour adsorption and fixation.

[0042] The mounting cavity 24 is slidably connected to a locking plate 27, and the locking plate 27 is provided with a through groove for the corresponding movable tube 21 to pass through. An anti-slip pad is installed on one side of the inner wall of the through groove to increase the contact friction between the locking plate 27 and the movable tube 21. A piston plate 28 is fixedly connected to the locking plate 27 and is slidably connected to the piston cavity 25.

[0043] When extracting gas from the cavity 23, the lightweight inner support stamping is gripped by negative pressure through the adsorption tube 22. Combined with the connection between the cavity 23 and the piston chamber 25, the gas in the piston chamber 25 is extracted simultaneously, causing the piston plate 28 to pull the locking plate 27 to move. This causes the anti-slip pad on the inner wall of the through groove to abut against the outer wall of the corresponding movable tube 21, thus locking the movable tube 21 and assisting in the stability after positioning and gripping. Then, the lightweight inner support stamping is positioned and installed onto the lightweight shell stamping by the robotic arm 11.

[0044] An air cylinder 215 communicating with the cavity 23 is fixedly installed on one side of the top of the base 2. A piston block 216 is slidably connected inside the air cylinder 215. An electric push rod 217 that drives the piston block 216 to slide is installed on the mounting frame 12. The electric push rod 217 drives the piston block 216 to move upward, drawing the gas inside the cavity 23 into the air cylinder 215, realizing negative pressure adsorption gripping and locking the position of the movable tube 21.

[0045] The base 2 has a rivet hole in the middle. The robotic arm 11 moves the base 2 above the lightweight inner support stamping part through the mounting frame 12, and makes the rivet point of the lightweight inner support stamping part coaxial with the center of the rivet hole. Then, it pushes the base 2 to move vertically downward, so as to provide multi-point equal force support around different rivet points, build a distributed support network, and further realize the adaptive balance of internal stress of the stamping part around different rivet points.

[0046] A guide pin sleeve 3 is installed at the top of the riveting hole. Multiple elastic plates 31 that abut against the inner wall of the riveting hole are fixedly connected to the bottom of the guide pin sleeve 3. The elastic plates 31 are L-shaped. The rivet moves out from the feed rail 43 and falls into the riveting hole through the guide pin sleeve 3. The multiple elastic plates 31 assist in centering the rivet to achieve precise riveting. Then, it is pressed down into the riveting hole by the riveting rod 42, which pushes the rivet down and causes the elastic plates 31 to deform and separate. The lightweight inner support stamping and the lightweight shell stamping are riveted together by the rivet.

[0047] The riveting mechanism includes a hydraulic cylinder 4 fixedly mounted on the mounting frame 12. The piston rod end of the hydraulic cylinder 4 is equipped with a riveting rod 42 via a connecting plate 41. A rivet feeding rail 43 for feeding rivets is slidably connected to the mounting frame 12.

[0048] A linkage frame 44 is fixedly connected to the top of the nail feeding rail 43, and a Z-shaped groove 45 is provided on the linkage frame 44. A guide rod 46 that is slidably connected to the Z-shaped groove 45 is fixedly connected to the connecting plate 41. A limiting plate 47 that is slidably connected to the rail groove of the nail feeding rail 43 is fixedly connected to the top of the base body 2. During the process of the hydraulic cylinder 4 pushing the riveting rod 42 down, the sliding of the guide rod 46 on the connecting plate 41 within the Z-shaped groove 45 causes the linkage frame 44 to carry the nail feeding rail 43 away from the riveting rod 42 and move horizontally.

[0049] During the movement of the feed rail 43, the rivet is limited by the internal sliding limit plate 47 to restrict the rivet's follow-up movement. When one end of the feed rail 43 moves away from the top of the guide sleeve 3, one rivet inside moves out of the feed rail 43 and falls into the riveting hole through the guide sleeve 3. A feed tube is installed on one side of the top of the feed rail 43. The rivet rod 42 rises and resets. Combined with the guide rod 46 and the Z-shaped groove 45, it drives one end of the feed rail 43 to move again above the guide sleeve 3, and drives the internal rivet to move synchronously. Then, the feed tube replenishes the missing rivet in the feed rail 43.

[0050] Example 2: Please refer to Figures 8-11 As shown, the following solutions can be used to address the problem that some adsorption tubes cannot contact the stamped parts, thus preventing adsorption and gripping and making it unusable for small-sized stamped parts.

[0051] In this embodiment, a sealing sleeve 29 is rotatably connected to the adsorption tube 22 and is slidably connected to the movable tube 21. A sealing ring is installed on the annular outer wall of the sealing sleeve 29 near the two end faces. A sealing ring that slides with the movable tube 21 is installed on the seat 2. The sealing sleeve 29 and the adsorption tube 22 rotate with damping. An air groove 210 penetrating through the top of the sealing sleeve 29 is opened on the inner wall of the sealing sleeve 29. A slot 211 that cooperates with the air groove 210 is opened on the adsorption tube 22. A sealing gasket is embedded on the outer wall of the adsorption tube 22 around the slot 211.

[0052] The relative rotation between the sealing sleeve 29 and the adsorption tube 22 causes the air groove 210 on the inner wall of the sealing sleeve 29 to communicate with the groove 211 on the adsorption tube 22. This allows the adsorption tube 22 to communicate with the cavity 23 via the groove 211, the air groove 210, the movable tube 21, and the cavity 23, thereby controlling the corresponding adsorption area and enabling the gripping of small stamped parts.

[0053] A second spring 212 is fixedly connected between the top of the sealing sleeve 29 and the cavity 23. Guide pins 213 are symmetrically fixed on the outer walls of both sides of the sealing sleeve 29. An oblique groove 214 that slides with the guide pins 213 is opened on the inner wall of the movable tube 21.

[0054] As the seat 2 descends, the suction cup on the adsorption tube 22 contacts the lightweight inner support stamping, causing the adsorption tube 22, carrying the sealing sleeve 29, to move upward relative to the movable tube 21 and compress the second spring 212. Combined with the adsorption tube 22 resisting the lightweight inner support stamping to limit the rotation of the adsorption tube 22, and the guide pin 213 guided by the inclined groove 214, the sealing sleeve 29 deflects synchronously, causing the air groove 210 on the inner wall of the sealing sleeve 29 to automatically connect with the groove 211 on the adsorption tube 22.

[0055] Then, the inclined groove 214 limits the guide pin 213, thereby pushing the movable tube 21 to compress the first spring 26, causing the bottom of the multiple adsorption tubes 22 to form a multi-point conformal structure that matches the surface of the lightweight inner support stamping part, and the cross-section of the movable tube 21 is in a shape other than a complete circle, so as to avoid the problem of the movable tube 21 rotating.

[0056] Example 3: Please refer to Figures 1-11 As shown, the present invention also proposes a method for using an adaptive positioning and riveting fixture for lightweight stamped parts of power battery packs, including the following steps:

[0057] Step 1: Place the lightweight shell stamping part on the riveting table 1. The robotic arm 11 drives the base 2 to move above the lightweight inner support stamping part through the mounting frame 12, and makes the riveting point of the lightweight inner support stamping part coaxial with the center of the riveting hole. Then push the base 2 vertically downward, so that the bottom of multiple adsorption tubes 22 in the corresponding gripping area all come into contact with the lightweight inner support stamping part.

[0058] Step 2: As the suction cup on the adsorption tube 22 contacts the lightweight inner support stamping, the seat 2 continues to descend, causing the adsorption tube 22, carrying the sealing sleeve 29, to move upward relative to the movable tube 21 and compress the second spring 212. Combined with the adsorption tube 22 resisting the lightweight inner support stamping to restrict the rotation of the adsorption tube 22, and the guide pin 213 guided by the inclined groove 214, the sealing sleeve 29 deflects synchronously, causing the air groove 210 on the inner wall of the sealing sleeve 29 to communicate with the groove 211 on the adsorption tube 22, thereby causing the adsorption tube 22 to communicate with the movable tube 21 and the cavity 23 through the groove 211, the air groove 210, and the cavity 23.

[0059] Then, through the continued descent of the seat 2, combined with the limiting of the guide pin 213 by the inclined groove 214, the movable tube 21 is pushed to compress the first spring 26, causing the bottom of the multiple adsorption tubes 22 to form a multi-point conformal structure that matches the surface of the lightweight inner support stamping, and the second spring 212 is compressed a second time to increase the contact force between the suction cup and the lightweight inner support stamping. Among them, the adsorption tubes 22 that do not contact the lightweight inner support stamping are connected by the damping between the adsorption tubes 22 and the sealing sleeve 29, so that the adsorption tubes 22 and the sealing sleeve 29 do not rotate relative to each other, and thus this part of the adsorption tubes 22 does not communicate with the cavity 23.

[0060] Step 3: After completing the adaptive fitting, the electric push rod 217 drives the piston block 216 to move upward, drawing the gas inside the cavity 23 into the air cylinder 215, thereby performing negative pressure adsorption gripping on the lightweight inner support stamping part, and through the communication between the cavity 23 and the piston cavity 25, simultaneously drawing the gas inside the piston cavity 25, causing the piston plate 28 to pull the locking plate 27 to move, causing the anti-slip pad on the inner wall of the through groove to abut against the outer wall of the corresponding movable tube 21, performing a movement locking process on the movable tube 21, and then the robotic arm 11 positions and installs the adsorbed lightweight inner support stamping part onto the lightweight shell stamping part;

[0061] Step 4: The hydraulic cylinder 4 pushes the riveting rod 42 to move downward. Through the sliding of the guide rod 46 on the connecting plate 41 in the Z-shaped groove 45, the linkage frame 44 carries the feeding rail 43 away from the riveting rod 42 and moves horizontally. During the movement of the feeding rail 43, the rivet is limited by the internal sliding limit plate 47 to restrict the rivet from following. When one end of the feeding rail 43 moves away from the top of the guide sleeve 3, a rivet inside moves out from the feeding rail 43 and falls into the riveting hole through the guide sleeve 3. The multiple elastic plates 31 in the riveting hole help to center the rivet. Then, the rivet is pressed down into the riveting hole with the riveting rod 42, pushing the rivet down and causing the elastic plates 31 to deform and separate. The lightweight inner support stamping and the lightweight shell stamping are riveted together by the rivet.

[0062] During the riveting process, the lightweight inner support stamping is grasped by equal force adsorption at various points through multiple movable tubes 21 and adsorption tubes 22, avoiding the problem of concentrated force at the riveting point causing the lightweight inner support stamping to deform easily. After the riveting is completed, the riveting rod 42 rises and resets, the elastic sheet 31 deforms and resets, and as the riveting rod 42 rises, it is combined with the guide rod 46 and the Z-shaped groove 45 to drive one end of the feeding rail 43 to move again above the guide sleeve 3, and drive the internal rivets to move accordingly, and the missing rivets in the feeding rail 43 are supplemented through the feeding tube.

[0063] The above description is only 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. An adaptive positioning riveting fixture for lightweight stamped parts of power battery packs, comprising a riveting table (1) and a robotic arm (11) mounted on the riveting table (1), characterized in that, The robotic arm (11) is equipped with a mounting frame (12), and the mounting frame (12) is provided with a gripping mechanism for adaptive conformal fitting of the stamping parts and a riveting mechanism for self-feeding rivets. The gripping mechanism includes a base (2) fixedly connected to the mounting frame (12). The bottom of the base (2) is provided with several movable tubes (21), and an adsorption tube (22) with a sealed top is movably installed inside the movable tube (21). The bottom of the adsorption tube (22) is connected to a suction cup. The seat (2) has a cavity (23) inside and a mounting cavity (24) located below the cavity (23). A piston cavity (25) communicating with the cavity (23) is provided on one side of the mounting cavity (24). The movable tube (21) is slidably connected to the seat (2), and a first spring (26) is fixedly connected between the top of the movable tube (21) and the cavity (23). The adsorption tube (22) is rotatably connected to a sealing sleeve (29) that is slidably connected to the movable tube (21), and the sealing sleeve (29) and the adsorption tube (22) are damped to rotate. The inner wall of the sealing sleeve (29) is provided with an air groove (210) that penetrates its top, and the adsorption tube (22) is provided with a slot (211) that cooperates with the air groove (210). A second spring (212) is fixedly connected between the top of the sealing sleeve (29) and the cavity (23). Guide pins (213) are symmetrically fixed on the outer walls of both sides of the sealing sleeve (29). An oblique groove (214) that slides with the guide pin (213) is opened on the inner wall of the movable tube (21).

2. The adaptive positioning and riveting fixture for lightweight stamped parts based on power battery packs according to claim 1, characterized in that, The mounting cavity (24) is slidably connected to a locking plate (27), and the locking plate (27) is provided with a through groove for the corresponding movable tube (21) to pass through. An anti-slip pad is installed on one side of the inner wall of the through groove. A piston plate (28) is fixedly connected to the locking plate (27) and is slidably connected to the piston cavity (25).

3. The adaptive positioning and riveting fixture for lightweight stamped parts based on power battery packs according to claim 1, characterized in that, An air cylinder (215) communicating with the cavity (23) is fixedly installed on one side of the top of the seat (2). A piston block (216) is slidably connected inside the air cylinder (215). An electric push rod (217) for driving the piston block (216) to slide is installed on the mounting bracket (12).

4. The adaptive positioning and riveting fixture for lightweight stamped parts based on power battery packs according to claim 1, characterized in that, The seat (2) has a rivet hole in the middle. A guide pin sleeve (3) is installed on the top of the rivet hole. A plurality of elastic pieces (31) that abut against the inner wall of the rivet hole are fixedly connected to the bottom of the guide pin sleeve (3). The elastic pieces (31) have an L-shaped structure.

5. The adaptive positioning and riveting fixture for lightweight stamped parts based on power battery packs according to claim 1, characterized in that, The riveting mechanism includes a hydraulic cylinder (4) fixedly mounted on a mounting frame (12). The piston rod end of the hydraulic cylinder (4) is fitted with a riveting rod (42) via a connecting plate (41). A rivet feeding rail (43) for feeding rivets is slidably connected to the mounting frame (12).

6. The adaptive positioning and riveting fixture for lightweight stamped parts based on power battery packs according to claim 5, characterized in that, The top of the feeding rail (43) is fixedly connected to a linkage frame (44), and a Z-shaped groove (45) is provided on the linkage frame (44). A guide rod (46) that is slidably connected to the Z-shaped groove (45) is fixedly connected to the connecting plate (41). A limiting plate (47) that is slidably connected to the groove of the feeding rail (43) is fixedly connected to the top of the seat (2). A feeding tube is installed on one side of the top of the feeding rail (43).

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