Resistance spot welding auxiliary self-piercing riveting device and portable flexible riveting mechanism

Abstract

The utility model relates to a resistance spot welding auxiliary self-piercing riveting device and a portable flexible riveting mechanism. The riveting device comprises a lifting assembly, a rivet conveying structure, a boss, a positive electrode copper pipe, a punch, a negative electrode copper pipe, a female die and a C-shaped frame. The lifting assembly is installed above an opening of the C-shaped frame, the punch is connected with the output end of the lifting assembly, and the positive electrode copper pipe and the boss are sequentially and coaxially arranged on the lower portion of the punch in the circumferential direction from inside to outside. The rivet conveying structure is installed on the C-shaped frame and used for conveying rivets to the position below the punch. The female die is fixed to the lower end of an opening of the C-shaped frame and located under the boss, and the negative electrode copper pipe is coaxially arranged on the outer side of the female die. A through groove convenient for hand holding is formed in the C-shaped frame; and the C-shaped frame is connected with the flexible connecting device through the universal adjusting arm. According to the utility model, the combined operation of riveting and welding is realized, the problem of insufficient self-piercing riveting strength in an upper-aluminum lower-steel structure is effectively solved, and the connecting effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering, and in particular to a resistance spot welding-assisted self-piercing riveting device and a convenient flexible riveting mechanism. Background Technology

[0002] With the development of new energy vehicles, competition within the industry has intensified, and new models are constantly being launched. Statistics show that most new cars have not become bestsellers, with sales remaining mediocre. In this context, excessive initial investment in fixed equipment can lead to project losses. Meanwhile, lightweighting of automotive bodies has become an industry trend, and the widespread application of new materials such as aluminum alloys, high-strength steel, and composite materials is one of the key ways to achieve weight reduction. Self-piercing riveting (SPR) technology, with its advantage of not requiring pre-drilling, has been widely used in joining dissimilar materials such as aluminum and steel, especially suitable for "steel on top, aluminum on the bottom" structural designs, providing high connection strength. However, in actual designs, some applications require a "aluminum on top, steel on the bottom" structure, particularly in the connection of aluminum alloys and high-strength steel. In such cases, due to the high hardness and thinness of the steel, the rivet cannot fully extend to achieve self-locking, and the riveting process may also lead to rivet upsetting fracture, resulting in the structure failing to achieve the designed connection strength.

[0003] 1. The production equipment for automobile projects is large in size. When a new project comes along, it is difficult to move the equipment to the nearest location to support the project in a timely manner and reduce costs. Instead, it is necessary to continue to increase investment in the production equipment for the project, which poses a risk of loss.

[0004] 2. During automobile body production, in the "aluminum on top, steel on the bottom" scenario where aluminum alloy and high-strength steel are joined using the SPR connection process, the rivets have difficulty effectively penetrating the high-strength steel and unfolding to form a self-locking connection, resulting in the connection strength at the connection point not meeting the design requirements. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a resistance spot welding-assisted self-piercing riveting device and a convenient flexible riveting mechanism. Through integrated process design, it integrates the principle and structure of resistance spot welding connection on the basis of traditional SPR riveting gun, solving the problem of insufficient SPR riveting strength in the "aluminum on top, steel on the bottom" scenario of connecting aluminum alloy and high-strength steel. It can meet production needs and can also be quickly and conveniently transferred to a predetermined position as needed.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] A resistance spot welding-assisted self-piercing riveting device, the riveting device comprising a lifting assembly, a rivet conveying structure, a boss, a positive electrode copper tube, a punch, a negative electrode copper tube, a die, and a C-frame;

[0008] The lifting assembly is installed above the opening of the C-frame. The punch is connected to the output end of the lifting assembly. The positive electrode copper tube and the boss are arranged coaxially from the inside to the outside in the lower part of the circumference of the punch.

[0009] The rivet conveying structure is installed on the C-frame and is used to convey the rivet to the area below the punch; the die is fixed at the lower end of the opening of the C-frame and is located directly below the boss; the negative electrode copper tube is coaxially arranged on the outside of the die.

[0010] The C-frame has a through slot for easy hand gripping.

[0011] Furthermore, the rivet conveying structure includes a rivet storage structure and a conveying structure; the rivet storage structure conveys the rivets in the rivet storage structure to below the punch through the conveying structure.

[0012] This utility model also discloses a convenient flexible riveting mechanism, which includes the resistance spot welding assisted self-piercing riveting device, the universal adjusting arm, and the flexible connecting device described above. The flexible connecting device includes a support column, a suspension arm, a pulley assembly, and a rotary bearing assembly. The suspension arm is mounted on the upper part of the support column through the rotary bearing assembly. The pulley assembly is slidably mounted on the suspension arm. The lower end of the universal adjusting arm is connected to the C-frame of the resistance spot welding assisted self-piercing riveting device. The upper end of the universal adjusting arm is connected to the pulley assembly through a steel wire rope.

[0013] Furthermore, the convenient flexible riveting mechanism also includes control cables and an auxiliary system; the auxiliary system includes a welding transformer and a power supply cabinet; the power supply cabinet is connected to the welding transformer, and the welding transformer is connected to the positive electrode copper tube and the negative electrode copper tube respectively through the control cable; the welding transformer is used to convert the current supplied by the power supply cabinet into the required welding current and supply it to the current loop formed by the positive electrode copper tube and the negative electrode copper tube.

[0014] Meanwhile, the power supply cabinet is connected to the lifting assembly and the rivet conveying structure respectively through the control cable, and supplies power to the lifting assembly and the rivet conveying structure.

[0015] Furthermore, the suspension arm is provided with a sliding rail, and the sliding assembly consists of two pulleys; the two pulleys are slidably mounted on the sliding rail; the outer pulley is connected to the steel wire rope connecting the universal adjusting arm through a balancer, and the inner pulley is provided with a hook for pulling the control cable.

[0016] Furthermore, the auxiliary system also includes a cooling system for cooling the rivet welding position.

[0017] Furthermore, the rotary bearing assembly includes an upper bearing, a lower bearing, a connecting rod, and a mounting bracket. The two mounting brackets are fixed to the support column at an interval. The upper and lower ends of the connecting rod are respectively mounted on the mounting bracket through the upper bearing and the lower bearing. The suspension arm is connected to the connecting rod.

[0018] Furthermore, an intermediate plate is mounted in the middle of the connecting rod; the connecting rod between the intermediate plate and the lower bearing is connected to the suspension arm; the connecting rod between the intermediate plate and the upper bearing is connected to the suspension arm via a steel wire rope; the flexible connection device also includes a limiting block and a stop block; the two limiting blocks are horizontally spaced on the intermediate plate; the stop block is mounted on the support column; the stop block prevents the suspension arm from continuing to rotate by contacting the limiting block.

[0019] Furthermore, the flexible connection device also includes a base platform, casters, and telescopic support feet; the support column is fixed in the middle of the base platform; multiple casters are evenly distributed below the base platform; and telescopic support feet are installed at both ends of opposite sides of the base platform, wherein the telescopic support feet can adjust the length laterally and the height longitudinally.

[0020] Furthermore, multiple suspension arms are evenly distributed around the support column in the circumferential direction and are respectively mounted on the support column via the rotary bearing assembly.

[0021] The beneficial effects of this utility model are:

[0022] The resistance spot welding-assisted self-piercing riveting device in this utility model's convenient flexible riveting mechanism integrates a resistance spot welding structure with the traditional riveting gun, realizing the combined operation of riveting and welding. This innovates the process, improves the connection strength, and the entire mechanism can be flexibly moved and arranged to adapt to different production needs, simplifying the installation and disassembly process.

[0023] This utility model's resistance spot welding-assisted self-piercing riveting device performs resistance spot welding after riveting the workpiece. With the assistance of resistance spot welding heating, it can improve the bonding strength of self-piercing riveting in the "aluminum on top, steel on the bottom" structure. It is particularly suitable for the connection needs of multi-material car bodies, effectively solving the problem of insufficient self-piercing riveting strength in the "aluminum on top, steel on the bottom" structure and improving the connection effect.

[0024] The resistance spot welding-assisted self-piercing riveting device of this invention can adjust the riveting angle and riveting position through a universal adjusting arm to adapt to the connection needs under more working conditions.

[0025] The flexible connection device of this utility model adopts a portable and flexible design. The resistance spot welding assisted self-piercing riveting device can move flexibly along the suspension arm through the pulley assembly. The suspension arm can drive the resistance spot welding assisted self-piercing riveting device to rotate around the support column through the rotary bearing assembly, so as to realize the free movement of the resistance spot welding assisted self-piercing riveting device.

[0026] The flexible connection device of this utility model can realize the rapid and free movement of the flexible riveting mechanism through universal wheels, which facilitates the flexible adjustment of the production line layout according to different needs, simplifies the installation and disassembly process, and is especially suitable for adjusting and matching the needs of remote production.

[0027] This invention enables multiple resistance spot welding-assisted self-piercing riveting devices to be suspended on a single flexible connection device by setting multiple suspension arms around the support column, thereby achieving multi-station operation and reducing the overall footprint of the convenient flexible riveting mechanism.

[0028] This invention optimizes riveting and welding operations through an auxiliary system, resulting in stable and efficient operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the convenient flexible riveting mechanism of this utility model;

[0030] Figure 2 This is a schematic diagram of the resistance spot welding auxiliary self-piercing riveting device of this utility model;

[0031] Figure 3 This is a schematic diagram of the flexible connection device in this utility model;

[0032] Figure 4 This is a partial view of the flexible connecting device in this utility model;

[0033] Figure 5 This is a cross-sectional view of the present invention when riveting steel plates and aluminum alloy plates.

[0034] The components are as follows: 1-Resistance spot welding auxiliary self-piercing riveting device, 1.1-Power unit, 1.2-Rivet conveying structure, 1.3-Boss, 1.4-Positive electrode copper tube, 1.5-Punch, 1.6-Negative electrode copper tube, 1.7-Die, 1.8-C-frame, 2-Universal adjusting arm, 3-Control cable, 4-Flexible connection device, 4.1-Base platform, 4.2-Universal wheels, 4.3-Telescopic support foot, 4.4-Support column, 4.5-Suspension arm, 4.6-Wire rope, 4.7-Pulley assembly, 4.8-Balancer, 4.9-Rotary bearing assembly, 4.10-Limit block, 4.11-Stop block, 5-Auxiliary system, 6-Rivet, 7-Aluminum alloy plate, 8-Steel plate, 9-Base. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] The directional terms such as above, below, left, right, front, and back used in this application are based on the positional relationships shown in the attached drawings. Different attached drawings may result in different positional relationships, therefore they should not be interpreted as limitations on the scope of protection.

[0037] In this utility model, the terms "installation," "connection," "interlocking," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a connection that allows communication, a direct connection, or an indirect connection through an intermediate medium. They can also refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0038] This embodiment describes a resistance spot welding-assisted self-piercing riveting device and a convenient flexible riveting mechanism, which can improve the bonding strength of self-piercing riveting in the "aluminum on top and steel on the bottom" structure, and can also conveniently move the riveting device to a predetermined position.

[0039] like Figure 1 As shown, the convenient flexible riveting mechanism includes a resistance spot welding-assisted self-piercing riveting device 1, a universal adjusting arm 2, a control cable 3, a flexible connecting device 4, and an auxiliary system 5. The universal adjusting arm 2 is connected to the resistance spot welding-assisted self-piercing riveting device 1 by bolts, and the universal adjusting arm 2 is connected to the suspension arm of the flexible connecting device 4 by a steel wire rope, suspending the resistance spot welding-assisted self-piercing riveting device 1 on the suspension arm. At the same time, the resistance spot welding-assisted self-piercing riveting device 1 is connected to the auxiliary system 5 through the control cable 3.

[0040] In this embodiment, the resistance spot welding-assisted self-piercing riveting device 1 is as follows: Figure 2 As shown, it includes a power unit 1.1, a rivet conveying structure 1.2, a boss 1.3, a positive electrode copper tube 1.4, a punch 1.5, a negative electrode copper tube 1.6, a die 1.7, and a C-frame 1.8.

[0041] The power unit 1.1 is connected to the upper part of the punch 1.5 via a transmission unit and is mounted above the C-frame 1.8 via the transmission unit. The power unit 1.1 provides impact power to the punch 1.5 so that the punch 1.5 can drive the rivet 6 to perform impact operations. In this embodiment, the power unit 1.1 can use a servo motor, pneumatic device, or hydraulic device to provide impact power to the punch 1.5 in an electric, pneumatic, or hydraulic manner. When the transmission unit is used in combination with the servo motor, the transmission unit includes, but is not limited to, a screw transmission structure composed of a screw, nut, slider, etc. When the transmission unit is used in combination with a pneumatic device or hydraulic device, and its power is output linearly, the punch 1.5 can be directly pushed and pulled up and down through the output shaft.

[0042] The rivet conveying structure 1.2 is mounted on the C-frame 1.8 and is used to automatically position and convey rivets 6 below the punch 1.5, ensuring that the rivets 6 and the punch 1.5 impact downwards in the same axis, thus ensuring efficient and continuous self-riveting operations. The rivet conveying structure 1.2 includes a rivet storage structure and a conveying structure, etc. The rivet storage structure is connected to the conveying structure, and the conveying structure conveys the rivets 6 in the rivet storage structure to below the punch 1.5. In this embodiment, the conveying structure of the rivet conveying structure 1.2 includes a rivet band with an opening and a driving part. The rivet 6 is placed in the opening of the rivet band, and the driving part drives the rivet band to position and convey the rivet 6 to below the punch 1.5. Under the impact of the punch 1.5, the rivet 6 detaches from the rivet band.

[0043] At the upper end of the opening of the C-shaped frame 1.8, the positive electrode copper tube 1.4 and the boss 1.3 are coaxially arranged from the inside to the outside around the punch 1.5. The boss 1.3 and the positive electrode copper tube 1.4 can be connected by key or sliding fit. The power unit 1.1 drives the boss 1.3, the positive electrode copper tube 1.4 and the punch 1.5 to move downward to complete the self-piercing riveting operation.

[0044] The die 1.7 is fixed at the lower end of the opening of the C-frame 1.8, directly below the boss 1.3. The die 1.7 and the boss 1.3 together form the worktable of the resistance spot welding assisted self-piercing riveting device 1. The negative electrode copper tube 1.6 is coaxially arranged on the outside of the die 1.7. When riveting is completed, the resistance spot welding assisted self-piercing riveting device 1 is energized, and the positive electrode copper tube 1.4 and the negative electrode copper tube 1.6 cooperate to form a current loop to complete the resistance spot welding in the welding area.

[0045] The C-frame 1.8 in this embodiment has multiple through slots. The through slots reduce the weight of the C-frame 1.8 without affecting its strength, and at the same time make it easier for the operator to hold the resistance spot welding auxiliary self-piercing riveting device 1, which facilitates the operation.

[0046] The universal adjusting arm 2 is a U-shaped structure composed of multiple articulated arms or joints. The lower end of the universal adjusting arm 2 is bolted to the C-shaped frame 1.8 of the resistance spot welding assisted self-piercing riveting device 1. The upper end of the universal adjusting arm 2 is connected to the balancer 4.8 of the flexible connecting device 4 through a steel wire rope. The universal adjusting arm 2 can drive the resistance spot welding assisted self-piercing riveting device 1 to rotate in multiple directions, adjust the riveting angle and riveting position, so that the resistance spot welding assisted self-piercing riveting device 1 can move flexibly according to the operation requirements, making it convenient for the operator to perform the operation.

[0047] The flexible connection device 4 is a support and moving device for the resistance spot welding assisted self-piercing riveting device 1, such as... Figure 3 and Figure 4 As shown, the flexible connection device 4 includes a base platform 4.1, casters 4.2, telescopic support feet 4.3, support columns 4.4, suspension arms 4.5, steel wire ropes 4.6, pulley assembly 4.7, balancer 4.8, rotary bearing assembly 4.9, limit block 4.10, and stop block 4.11.

[0048] The base platform 4.1 serves as the supporting foundation for the entire portable flexible riveting mechanism. It is made of steel and has multiple casters 4.2 evenly distributed around its bottom. For example, a caster 4.2 with a braking function can be welded to each of the four corners of the base platform 4.1 to ensure that the entire portable flexible riveting mechanism can move smoothly and steadily, and to keep the entire portable flexible riveting mechanism stationary during riveting and welding processes.

[0049] Telescopic support legs 4.3 are installed at both ends of opposite sides of the base platform 4.1. The connection between the telescopic support legs 4.3 and the base platform 4.1 includes, but is not limited to, welding and bolting. The telescopic support legs 4.3 have lateral and longitudinal telescopic structures to adjust the length laterally and the height longitudinally according to the ground conditions, thereby maintaining the balance of the base platform 4.1 and ensuring the stability of the center of gravity of the entire convenient flexible riveting mechanism. In addition, the longitudinal telescopic structure of the telescopic support legs 4.3 is a detachable structure composed of bolted connections, which facilitates transportation after disassembly.

[0050] The support column 4.4 is fixed to the middle of the base platform 4.1 by bolts. The support column 4.4 can be a polygonal column structure corresponding to the number of cantilever arms 4.5. Multiple cantilever arms 4.5 are evenly installed on the support column 4.4 around the top of the support column 4.4 by rotating bearing assemblies 4.9.

[0051] The rotary bearing assembly 4.9 of this embodiment includes an upper bearing, a lower bearing, a connecting rod, an intermediate plate, and a mounting bracket. Two mounting brackets are fixed vertically and horizontally to the support column 4.4. The upper and lower ends of the connecting rod are mounted on the mounting brackets via the upper and lower bearings, respectively. The intermediate plate is fixed to the middle of the connecting rod. The connecting rod between the intermediate plate and the lower bearing is bolted to the suspension arm 4.5. The connecting rod between the intermediate plate and the upper bearing is connected to the suspension arm 4.5 via a steel wire rope 4.6. Tightening the steel wire rope 4.6 enhances the stability of the flexible connection device 4 and makes the resistance spot welding assisted self-piercing riveting device 1 more stable and safer to move.

[0052] Two limit blocks 4.10 are horizontally spaced on the intermediate plate by bolts. The spacing angle between the two limit blocks 4.10 can be determined according to the predetermined rotation angle of the support column 4.4. A stop block 4.11 is fixed to the support column 4.4 between the two rotary bearing assemblies 4.9. When the suspension arm 4.5 rotates to the predetermined angle, the limit blocks 4.10 contact the stop block 4.11 to prevent the suspension arm 4.5 from rotating excessively and to avoid collisions between equipment on adjacent suspension arms 4.5.

[0053] A sliding rail is provided on the suspension arm 4.5, and the sliding assembly 4.7 is slidably installed on the sliding rail, allowing it to slide freely along the sliding rail on the suspension arm 4.5. The sliding assembly 4.7 consists of two pulleys, which are slidably installed on the sliding rail. The outer pulley is connected to the balancer 4.8 via a hook, and the balancer 4.8 is connected to the universal adjusting arm 2 via a wire rope. The inner pulley (i.e., near the support column 4.4) has a hook attached below it for pulling the control cable 3. The middle of the control cable 3 is hung on the hook to prevent the control cable 3 from falling to the ground, thereby preventing the control cable 3 from getting tangled and obstructing the operation during riveting, welding, and moving resistance spot welding auxiliary self-piercing riveting device 1.

[0054] In this embodiment, the balancer 4.8 can position and lock the steel wire rope to stabilize the resistance spot welding auxiliary self-piercing riveting device 1, thereby reducing the labor intensity required for the operator to stabilize the resistance spot welding auxiliary self-piercing riveting device 1.

[0055] The auxiliary system 5 is placed on the base platform 4.1 and includes components such as a welding transformer, power supply cabinet, control system, cooling system, water tank, and air storage system. The power supply cabinet is connected to the positive electrode copper tube 1.4 and negative electrode copper tube 1.6 of the resistance spot welding auxiliary self-piercing riveting device 1 via the welding transformer. The welding transformer converts the current supplied by the power supply cabinet into the required welding current and then supplies it to the current loop formed by the positive electrode copper tube 1.4 and negative electrode copper tube 1.6. Simultaneously, the power supply cabinet is connected to the power unit 1.1, control system, balancer 4.8, and cooling system via cables, providing power to the resistance spot welding auxiliary self-piercing riveting device 1, control system, balancer 4.8, and cooling system. The control system is connected to the resistance spot welding auxiliary self-piercing riveting device 1, welding transformer, power supply cabinet, and cooling system via control cables 3. The control system adjusts the welding current through the welding transformer, and the cooling system's spray nozzles are directed towards the riveting position to cool the welding position of the rivet 6. The cooling system sprays cooling water from the water tank onto the welding position, while the gas storage system sprays protective gas onto the welding position.

[0056] Taking the application of the convenient flexible riveting mechanism of this embodiment to rivet aluminum alloy plate 7 and steel plate 8 on a certain automobile welding production line as an example, the self-riveting operation process is illustrated as follows:

[0057] 1. After the portable flexible riveting mechanism is started, the control system initializes each subsystem such as the resistance spot welding assisted self-piercing riveting device 1, welding transformer, cooling system, and gas storage system, checks whether the power supply, gas source, water source and other connections are normal, and completes the self-inspection of the portable flexible riveting mechanism.

[0058] 2. The operator sets the riveting parameters through the control system and starts the riveting program. The rivet conveying structure 1.2 conveys the rivet 6 to the position below the punch 1.5. The power unit 1.1 drives the punch 1.5 to rise and fall through the transmission unit. The punch 1.5 drives the boss 1.3, the positive electrode copper tube 1.4, and the rivet 6 to move downwards towards the aluminum alloy plate 7 to be riveted. After the rivet 6 contacts the aluminum alloy plate 7, the punch 1.5 pushes the rivet 6 to penetrate the aluminum alloy plate 7 and the steel plate 8 until the boss 1.3 and the die 1.7 press the plates together. The power unit 1.1 drives the punch 1.5 and the positive electrode copper tube 1.4 to continue impacting the rivet 6 until the upper part of the rivet 6 is deformed by pressing. During the pressing process, the positive electrode copper tube 1.4 and the rivet 6 always maintain contact, completing the self-piercing riveting process.

[0059] like Figure 5 As shown, in this embodiment, after the rivet 6 is riveted to the aluminum alloy plate 7 and the steel plate 8, the upper part of the rivet 6 is deformed by the riveting, and the lower part is pressed into the steel plate 8, but does not protrude from the steel plate 8.

[0060] 3. After riveting is completed, the control system automatically switches to spot welding mode. The positive electrode copper tube 1.4 and the negative electrode copper tube 1.6 are powered by the welding transformer to heat the rivet 6 for resistance spot welding. The self-riveting connection strength is enhanced by welding the rivet 6 to the aluminum alloy plate 7 and the steel plate 8.

[0061] In this embodiment, because the lower part of the rivet 6 does not deform and is located inside the steel plate 8, there are no protruding weld points on the bottom surface of the steel plate 8 after welding. This can avoid gaps between the steel plate 8 and its connected parts, and will not cause problems such as poor equipment stability and increased equipment size after welding.

[0062] During the welding process, the heat generated by the resistance spot welding-assisted self-piercing riveting device 1 is dissipated through the cooling system to ensure that the temperature at the weld joint remains within a safe range. At the same time, the gas storage system sprays protective gas onto the weld joint, and the control system monitors various parameters in real time to ensure welding quality and the safety of the convenient flexible riveting mechanism.

[0063] Although the principles of this utility model have been described in detail above with reference to preferred embodiments, those skilled in the art should understand that the above embodiments are merely illustrative explanations of the implementation of this utility model and are not intended to limit the scope of this utility model. The details in the embodiments do not constitute a limitation on the scope of this utility model. Any obvious changes, such as equivalent transformations or simple substitutions, based on the technical solution of this utility model without departing from its spirit and scope fall within the protection scope of this utility model.

Claims

1. A resistance spot welding-assisted self-piercing riveting device, characterized in that, The riveting device (1) includes a lifting assembly, a rivet conveying structure (1.2), a boss (1.3), a positive electrode copper tube (1.4), a punch (1.5), a negative electrode copper tube (1.6), a die (1.7), and a C-frame (1.8); The lifting assembly is installed above the opening of the C-frame (1.8), and the punch (1.5) is connected to the output end of the lifting assembly. The positive electrode copper tube (1.4) and the boss (1.3) are arranged coaxially from the inside to the outside around the punch (1.5). The rivet conveying structure (1.2) is installed on the C-frame (1.8) and is used to convey the rivet (6) to the bottom of the punch (1.5); the die (1.7) is fixed at the lower end of the opening of the C-frame (1.8) and is located directly below the boss (1.3); the negative electrode copper tube (1.6) is coaxially arranged on the outside of the die (1.7); The C-frame (1.8) has a through slot for easy hand gripping.

2. The resistance spot welding-assisted self-piercing riveting device according to claim 1, characterized in that, The rivet conveying structure (1.2) includes a rivet storage structure and a conveying structure; the rivet storage structure conveys the rivets (6) in the rivet storage structure to the bottom of the punch (1.5) through the conveying structure.

3. A convenient flexible riveting mechanism, characterized in that, The convenient flexible riveting mechanism includes the resistance spot welding assisted self-piercing riveting device (1) as described in claim 1 or 2, a universal adjusting arm (2), and a flexible connecting device (4); the flexible connecting device (4) includes a support column (4.4), a suspension arm (4.5), a pulley assembly (4.7), and a rotary bearing assembly (4.9); the suspension arm (4.5) is mounted on the upper part of the support column (4.4) through the rotary bearing assembly (4.9); the pulley assembly (4.7) is slidably mounted on the suspension arm (4.5); the lower end of the universal adjusting arm (2) is connected to the C-frame (1.8) of the resistance spot welding assisted self-piercing riveting device (1); the upper end of the universal adjusting arm (2) is connected to the pulley assembly (4.7) through a steel wire rope.

4. The convenient flexible riveting mechanism according to claim 3, characterized in that, The convenient flexible riveting mechanism also includes a control cable (3) and an auxiliary system (5); the auxiliary system (5) includes a welding transformer and a power supply cabinet; the power supply cabinet is connected to the welding transformer, and the welding transformer is connected to the positive electrode copper tube (1.4) and the negative electrode copper tube (1.6) respectively through the control cable (3). The welding transformer is used to convert the current transmitted by the power supply cabinet into the required welding current and transmit it to the current loop formed by the positive electrode copper tube (1.4) and the negative electrode copper tube (1.6); Meanwhile, the power supply cabinet is connected to the lifting assembly and the rivet conveying structure (1.2) respectively through the control cable (3) to supply power to the lifting assembly and the rivet conveying structure (1.2).

5. The convenient flexible riveting mechanism according to claim 4, characterized in that, The suspension arm (4.5) is provided with a sliding rail, and the pulley assembly (4.7) consists of two pulleys; the two pulleys are slidably installed on the sliding rail; the outer pulley is connected to the wire rope connecting the universal adjusting arm (2) through a balancer (4.8), and the inner pulley is provided with a hook, which is used to pull the control cable (3).

6. The convenient flexible riveting mechanism according to claim 4, characterized in that, The auxiliary system (5) also includes a cooling system; the cooling system is used to cool the welding position of the rivet (6).

7. The convenient flexible riveting mechanism according to claim 3, characterized in that, The rotary bearing assembly (4.9) includes an upper bearing, a lower bearing, a connecting rod, and a mounting bracket. The two mounting brackets are fixed to the support column (4.4) at intervals. The upper and lower ends of the connecting rod are respectively mounted on the mounting brackets through the upper bearing and the lower bearing. The suspension arm (4.5) is connected to the connecting rod.

8. The convenient flexible riveting mechanism according to claim 7, characterized in that, An intermediate plate is mounted in the middle of the connecting rod; the connecting rod between the intermediate plate and the lower bearing is connected to the suspension arm (4.5); the connecting rod between the intermediate plate and the upper bearing is connected to the suspension arm (4.5) via a steel wire rope (4.6); the flexible connecting device (4) further includes a limiting block (4.10) and a stop block (4.11); the two limiting blocks (4.10) are horizontally spaced on the intermediate plate; the stop block (4.11) is mounted on the support column (4.4); the stop block (4.11) prevents the suspension arm (4.5) from continuing to rotate by contacting the limiting block (4.10).

9. The convenient flexible riveting mechanism according to claim 3, characterized in that, The flexible connecting device (4) further includes a base platform (4.1), casters (4.2), and telescopic support feet (4.3); the support column (4.4) is fixed in the middle of the base platform (4.1); multiple casters (4.2) are evenly distributed under the base platform (4.1); the telescopic support feet (4.3) are respectively installed at both ends of opposite sides of the base platform (4.1), and the telescopic support feet (4.3) can adjust the length laterally and the height longitudinally.

10. The convenient flexible riveting mechanism according to claim 3, characterized in that, Multiple suspension arms (4.5) are evenly distributed around the support column (4.4) and are respectively mounted on the support column (4.4) via the rotary bearing assembly (4.9).

Images