Portable flexible riveting mechanism

Abstract

The invention relates to a flexible riveting mechanism convenient to use. The riveting mechanism comprises a resistance spot welding auxiliary self-perforating riveting device, a universal adjusting arm and a flexible connecting device. The resistance spot welding auxiliary self-piercing 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 drives the boss and the positive electrode copper pipe to move up and down through the punch. The rivet conveying structure conveys the rivet to the position below the punch; the female die and the boss jointly form a working table; after the punch drives the rivet to press downwards, the resistance spot welding auxiliary self-piercing riveting device is powered on, the positive electrode copper pipe and the negative electrode copper pipe form a current loop, and resistance spot welding is carried out; the flexible connecting device comprises a supporting column, a suspension arm and a rotating bearing assembly. And the C-shaped frame is connected with the suspension arm through the universal adjusting arm. According to the self-piercing riveting device, the combined operation of riveting and welding is achieved, the problem that the self-piercing riveting strength is insufficient in an upper-aluminum lower-steel structure is effectively solved, and the connecting effect is improved.

Description

Technical Field

[0001] The invention relates to the field of mechanical engineering, and in particular to a portable flexible riveting mechanism. Background Art

[0002] With the development of new energy vehicles, competition in the industry is fierce, and new models are constantly being launched. According to statistics, most new cars have not become popular and have mediocre sales. At this time, if the investment in fixed equipment in the early stage of the project is too large, it will lead to losses in the project. At the same time, lightweighting of automobile 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 of the body. Self-piercing riveting (SPR) technology has been widely used in the connection of dissimilar materials such as aluminum and steel due to the advantage of not requiring pre-drilling. It is especially suitable for the structural design of "upper steel and lower aluminum" and can provide higher connection strength. However, in actual design, some application scenarios require the structural form of "upper aluminum and lower steel", especially the scene of connecting aluminum alloy and high-strength steel. At this time, due to the high hardness and thin thickness of steel, the rivet cannot be fully expanded to achieve self-locking. The riveting process may also cause the rivet to break due to upsetting, resulting in the structure failing to achieve the designed connection strength.

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

[0004] 2. During the production of automobile bodies, in the "aluminum on top and steel on bottom" scenario where aluminum alloy and high-strength steel are connected by the SPR connection process, it is difficult for rivets to effectively penetrate the high-strength steel and expand to form a self-locking connection, resulting in the connection strength of the connection point failing to meet the design requirements. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a convenient flexible riveting mechanism. Through the integrated design of the process, on the basis of the traditional SPR rivet gun, the principle structure of the resistance spot welding connection is integrated to solve the problem of insufficient SPR riveting strength in the "upper aluminum and lower steel" scenario of connecting aluminum alloy and high-strength steel, which can meet the production needs and can also be quickly and conveniently transferred to the predetermined position as needed.

[0006] To achieve the above purpose, the specific technical solution of the present invention is as follows:

[0007] A convenient flexible riveting mechanism, the riveting mechanism comprising a resistance spot welding assisted self-piercing riveting device, a universal adjustment arm, and a flexible connecting device;

[0008] The resistance spot welding assisted self-piercing riveting device comprises 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-shaped frame;

[0009] The punch is installed at the upper end of the C-shaped frame opening through the lifting assembly, and the positive electrode copper tube and the boss are coaxially arranged in sequence from the inside to the outside at the lower part of the punch; the lifting assembly drives the boss and the positive electrode copper tube to move up and down through the punch;

[0010] The rivet conveying structure is installed above the C-shaped frame and is used to convey the rivets to the bottom of the punch;

[0011] The die is fixed at the lower end of the opening of the C-shaped frame, and is located directly below the boss. The die and the boss together constitute a work surface, and the negative electrode copper tube is coaxially arranged on the outside of the die; the punch drives the rivet downward to press the rivet, and after the riveting is completed, the resistance spot welding auxiliary self-piercing riveting device is energized, and the positive electrode copper tube cooperates with the negative electrode copper tube to form a current loop for resistance spot welding;

[0012] The flexible connection device comprises a support column, a suspension arm, and a rotating bearing assembly; the suspension arm is installed on the upper part of the support column through the rotating bearing assembly; and the C-shaped frame is connected to the suspension arm through the universal adjustment arm.

[0013] 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.

[0014] Furthermore, the flexible connection device also includes a pulley assembly; a sliding track is provided on the suspension arm; the pulley assembly is slidably installed on the sliding track; and the upper end of the universal adjustment arm is connected to the pulley assembly through a steel wire rope.

[0015] Furthermore, the portable flexible riveting mechanism also includes a control cable 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 respectively connected to the positive electrode copper tube and the negative electrode copper tube through the control cable, and the welding transformer converts the current delivered by the power supply cabinet into the required welding current, and then delivers it to the current loop composed of the positive electrode copper tube and the negative electrode copper tube;

[0016] At the same time, the power supply cabinet is connected to the lifting assembly and the rivet conveying structure respectively through the control cable to supply power to the lifting assembly and the rivet conveying structure.

[0017] Furthermore, the sliding assembly consists of two pulleys; the two pulleys are respectively slidably installed on the sliding track; the outer pulley is connected to the steel wire rope connected to the universal adjustment arm through a balancer, and the inner pulley is provided with a hook, which is used to pull the control cable.

[0018] Furthermore, the auxiliary system also includes a cooling system; the cooling system is used to cool the rivet welding position.

[0019] Furthermore, the rotating bearing assembly includes an upper bearing, a lower bearing, a connecting rod, and a mounting frame. The two mounting frames are fixed on the support column at upper and lower intervals. The upper and lower ends of the connecting rod are respectively installed on the mounting frame through the upper bearing and the lower bearing; the suspension arm is connected to the connecting rod.

[0020] Furthermore, an intermediate disk is installed in the middle of the connecting rod; the connecting rod between the intermediate disk and the lower bearing is connected to the suspension arm; the connecting rod between the intermediate disk and the upper bearing is connected to the suspension arm through a steel wire suspension rope; the flexible connection device also includes a limit block and a stop block; two limit blocks are installed on the intermediate disk with horizontal intervals; the stop block is installed on the support column; when the limit block contacts the stop block, the suspension arm is prevented from continuing to rotate.

[0021] Furthermore, the flexible connection device also includes a base platform, universal wheels, and telescopic support legs; the support column is fixed in the middle of the base platform; a plurality of universal wheels are evenly distributed under the base platform; the telescopic support legs are respectively installed at both ends of the opposite sides of the base platform, and the telescopic support legs are adjusted in length laterally and in height longitudinally according to ground conditions to keep the base platform balanced.

[0022] Furthermore, a plurality of suspension arms are evenly distributed around the circumference of the support column and are respectively mounted on the support column through the rotary bearing assembly.

[0023] Beneficial effects of the present invention:

[0024] The resistance spot welding assisted self-piercing riveting device in the portable flexible riveting mechanism of the present invention integrates the resistance spot welding structure on the basis of the traditional riveting gun, realizes the combined operation of riveting and welding, innovates the process, improves the connection strength, and the overall mechanism can be flexibly transferred and arranged to adapt to different production needs, simplifying the installation and disassembly process.

[0025] When the resistance spot welding assisted self-piercing riveting device of the present invention is in operation, resistance spot welding is performed after riveting the workpieces, which can improve the bonding strength of the self-piercing riveting in the "upper aluminum and lower steel" structure with the assistance of resistance spot welding heating. It is particularly suitable for the connection requirements of multi-material car bodies, effectively solves the problem of insufficient strength of the self-piercing riveting in the "upper aluminum and lower steel" structure, and improves the connection effect.

[0026] The resistance spot welding assisted self-piercing riveting device of the present invention can adjust the riveting angle and the riveting position through a universal adjustment arm to meet the connection requirements under more working conditions.

[0027] The flexible connection device of the present invention adopts a portable flexible design. The resistance spot welding assisted self-piercing riveting device can be flexibly moved 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 rotating bearing assembly, thereby realizing the free movement of the resistance spot welding assisted self-piercing riveting device.

[0028] The flexible connection device of the present invention can realize the fast and free movement of the flexible riveting mechanism through the universal wheel, which is convenient for flexible adjustment of the production line layout according to different needs, simplifies the installation and disassembly process, and is particularly suitable for adjustment and matching of production needs in different locations.

[0029] The present invention arranges a plurality of suspension arms around the support column, and can suspend a plurality of resistance spot welding-assisted self-piercing riveting devices on a flexible connection device, thereby realizing multi-station operation and reducing the overall footprint of the portable flexible riveting mechanism.

[0030] The present invention optimizes riveting and welding operations through an auxiliary system, and the operations are stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the convenient flexible riveting mechanism of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the resistance spot welding assisted self-piercing riveting device in the present invention;

[0033] Figure 3 It is a schematic diagram of the flexible connection device in the present invention;

[0034] Figure 4 It is a partial diagram of the flexible connection device in the present invention;

[0035] Figure 5 It is a cross-sectional view of the present invention when riveting a steel plate and an aluminum alloy plate.

[0036] Among them: 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 adjustment arm, 3-control cable, 4-flexible connection device, 4.1-bottom plate platform, 4.2-universal wheel, 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-rotating 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 DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] The terms such as up, down, left, right, front and back in this application document are based on the positional relationships shown in the drawings. If the drawings are different, the corresponding positional relationships may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0039] In the present invention, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or mutual communication, a direct connection or an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] This embodiment records a convenient flexible riveting mechanism, which can improve the bonding strength of the self-piercing riveting in the "upper aluminum and lower steel" structure, and can conveniently move the riveting device to a predetermined position.

[0041] like Figure 1 As shown, the portable flexible riveting mechanism includes a resistance spot welding assisted self-piercing riveting device 1, a universal adjustment arm 2, a control cable 3, a flexible connection device 4, and an auxiliary system 5. The universal adjustment arm 2 is connected to the resistance spot welding assisted self-piercing riveting device 1 through a bolt, and the universal adjustment arm 2 is connected to the suspension arm of the flexible connection device 4 through a steel wire rope, and the resistance spot welding assisted self-piercing riveting device 1 is suspended on the suspension arm, and the resistance spot welding assisted self-piercing riveting device 1 is connected to the auxiliary system 5 through the control cable 3.

[0042] In this embodiment, the resistance spot welding auxiliary self-piercing riveting device 1 is as follows: Figure 2As 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-shaped frame 1.8.

[0043] The power unit 1.1 is connected to the upper part of the punch 1.5 through the transmission unit, and is installed above the C-frame 1.8 through the transmission unit. The power unit 1.1 provides impact power to the punch 1.5 so that the punch 1.5 drives the rivet 6 to perform an impact operation. The power unit 1.1 of this embodiment can use a servo motor, a pneumatic device or a 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 a servo motor, the transmission unit includes but is not limited to a screw transmission structure composed of a screw, a nut, a slider, etc. When the transmission unit is used in combination with a pneumatic device or a hydraulic device, when its power is output in a linear manner, the punch 1.5 can be directly pushed and pulled up and down through the output shaft.

[0044] The rivet conveying structure 1.2 is installed on the C-frame 1.8, and is used to automatically position and convey the rivet 6 to the bottom of the punch 1.5, ensuring that the rivet 6 and the punch 1.5 impact downward coaxially to ensure efficient and continuous self-riveting operation. The rivet conveying structure 1.2 includes a rivet storage structure, a conveying structure, etc. The rivet storage structure is connected to the conveying structure, and the rivet 6 in the rivet storage structure is conveyed to the bottom of the punch 1.5 through the conveying structure. The conveying structure of the rivet conveying structure 1.2 of this embodiment includes a nail belt with an opening and a driving unit. The rivet 6 is placed in the opening of the nail belt. The driving unit drives the nail belt to position and convey the rivet 6 to the bottom of the punch 1.5. The rivet 6 is separated from the nail belt under the impact of the punch 1.5.

[0045] At the open upper end of the C-shaped frame 1.8, the positive electrode copper tube 1.4 and the boss 1.3 are coaxially arranged in sequence from the inside to the outside around the lower part of the punch 1.5, and the boss 1.3 and the positive electrode copper tube 1.4 can be movably connected by key connection 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.

[0046] The die 1.7 is fixed at the open lower end of the C-shaped frame 1.8, and is located directly below the boss 1.3. The die 1.7 and the boss 1.3 together constitute the working table of the resistance spot welding auxiliary self-piercing riveting device 1. The negative electrode copper tube 1.6 is coaxially arranged on the outside of the die 1.7. When the riveting is completed, the resistance spot welding auxiliary self-piercing riveting device 1 is energized, and the positive electrode copper tube 1.4 cooperates with the negative electrode copper tube 1.6 to form a current loop to complete the resistance spot welding in the welding area.

[0047] The C-frame 1.8 of this embodiment has a plurality of through slots, which reduce the weight of the C-frame 1.8 without affecting the strength of the C-frame 1.8, and also make it easier for the operator to hold the resistance spot welding auxiliary self-piercing riveting device 1, thereby facilitating the operation.

[0048] The universal adjustment arm 2 is a U-shaped structure composed of multiple articulated arms or joint articulations. The lower end of the universal adjustment arm 2 is bolted to the C-frame 1.8 of the resistance spot welding assisted self-piercing riveting device 1, and the upper end of the universal adjustment arm 2 is connected to the balancer 4.8 of the flexible connection device 4 through a steel wire rope. The universal adjustment arm 2 can drive the resistance spot welding assisted self-piercing riveting device 1 to rotate in multiple directions, adjust the riveting angle and the riveting position, so that the resistance spot welding assisted self-piercing riveting device 1 can be flexibly moved according to the operation requirements, which is convenient for the operator to operate.

[0049] The flexible connection device 4 is a support and moving device for the resistance spot welding auxiliary 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, a universal wheel 4.2, a telescopic support leg 4.3, a support column 4.4, a suspension arm 4.5, a steel wire rope 4.6, a pulley assembly 4.7, a balancer 4.8, a rotating bearing assembly 4.9, a limit block 4.10 and a stop block 4.11.

[0050] The bottom plate platform 4.1 is the supporting base of the entire portable flexible riveting mechanism, and is made of steel. A plurality of universal wheels 4.2 are evenly distributed around the bottom of the bottom plate platform 4.1. For example, a universal wheel 4.2 with a braking function is welded under each of the four corners of the bottom plate platform 4.1 to ensure that the entire portable flexible riveting mechanism can be moved smoothly and stably, and can keep the entire portable flexible riveting mechanism immobile during the riveting and welding process.

[0051] Telescopic support legs 4.3 are respectively installed at both ends of the opposite sides of the bottom plate platform 4.1, and the connection methods of the telescopic support legs 4.3 and the bottom plate platform 4.1 include but are not limited to welding connection and bolt connection. The telescopic support legs 4.3 have a transverse telescopic structure and a longitudinal telescopic structure, so that the length can be adjusted transversely and the height can be adjusted longitudinally according to the ground conditions to keep the bottom plate platform 4.1 balanced, so as to ensure the stability of the center of gravity of the entire portable flexible riveting mechanism. In addition, the longitudinal telescopic structure of the telescopic support legs 4.3 is a detachable structure composed of bolt connections, which is easy to transport after disassembly.

[0052] The support column 4.4 is fixed to the middle of the bottom plate platform 4.1 by bolts, and the support column 4.4 can be a polygonal column structure corresponding to the number of suspension arms 4.5. Multiple suspension arms 4.5 are evenly mounted on the support column 4.4 through rotating bearing assemblies 4.9 at the top of the support column 4.4.

[0053] The rotary bearing assembly 4.9 of this embodiment includes an upper bearing, a lower bearing, a connecting rod, an intermediate disk, and a mounting frame. The two mounting frames are fixed on the support column 4.4 at intervals. The upper and lower ends of the connecting rod are respectively mounted on the mounting frame through the upper bearing and the lower bearing. The intermediate disk is fixed to the middle of the connecting rod. The connecting rod between the intermediate disk and the lower bearing is fixedly connected to the suspension arm 4.5 through bolts. The connecting rod between the intermediate disk and the upper bearing is connected to the suspension arm 4.5 through a steel wire rope 4.6. By tightening the steel wire rope 4.6, the stability of the flexible connection device 4 can be enhanced, and the resistance spot welding auxiliary self-piercing riveting device 1 can be made more stable and safe when moving.

[0054] Two limit blocks 4.10 are installed horizontally and spaced apart on the middle plate by bolts, and 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 on the support column 4.4 between the two rotating bearing assemblies 4.9. When the suspension arm 4.5 rotates to a predetermined angle, the limit block 4.10 contacts the stop block 4.11 to prevent the suspension arm 4.5 from excessive rotation and avoid collision between devices on adjacent suspension arms 4.5.

[0055] The suspension arm 4.5 is provided with a sliding track, and the sliding assembly 4.7 is slidably mounted on the sliding track, and can slide freely along the sliding track on the suspension arm 4.5. The sliding assembly 4.7 is composed of two pulleys, and the two pulleys are slidably mounted on the sliding track, wherein the outer pulley is connected to the balancer 4.8 through a hook, and the balancer 4.8 is connected to the universal adjustment arm 2 through a wire rope, and the inner pulley (i.e., close to the support column 4.4) is connected to a hook below, which is used to pull the control cable 3, and the middle part of the control cable 3 is hung on the hook to prevent the control cable 3 from being scattered on the ground, thereby preventing the control cable 3 from being entangled and hindering the operation during riveting, welding operations and moving the resistance spot welding auxiliary self-piercing riveting device 1.

[0056] The balancer 4.8 of this embodiment can position and lock the steel wire rope to stabilize the resistance spot welding assisted self-piercing riveting device 1, thereby reducing the labor intensity required by the operator to stabilize the resistance spot welding assisted self-piercing riveting device 1.

[0057] The auxiliary system 5 is placed on the base plate platform 4.1, including components such as a welding transformer, a power supply cabinet, a control system, a cooling system, a water tank, and a gas storage system. The power supply cabinet is connected to the positive electrode copper tube 1.4 and the negative electrode copper tube 1.6 in the resistance spot welding auxiliary self-piercing riveting device 1 through the welding transformer. After the welding transformer converts the current delivered by the power supply cabinet into the required welding current, it is delivered to the current loop composed of the positive electrode copper tube 1.4 and the negative electrode copper tube 1.6. At the same time, the power supply cabinet is connected to the power unit 1.1, the control system, the balancer 4.8, and the cooling system by cables, and the power supply cabinet supplies power to the resistance spot welding auxiliary self-piercing riveting device 1, the control system, the balancer 4.8, and the cooling system. The control system is connected to the resistance spot welding auxiliary self-piercing riveting device 1, the welding transformer, the power supply cabinet, and the cooling system through control cables 3. The control system adjusts the welding current through the welding transformer, and the injection port of the cooling system faces the riveting position, which is used to cool the welding position of the rivet 6. The cooling system sprays the cooling water in the water tank to the welding position, and the gas storage system sprays the shielding gas to the welding position.

[0058] Taking the example of riveting an aluminum alloy plate 7 and a steel plate 8 using the portable flexible riveting mechanism of this embodiment on a certain automobile welding production line, the self-riveting operation process is described as follows:

[0059] 1. After the portable flexible riveting mechanism is started, the control system initializes the resistance spot welding auxiliary self-piercing riveting device 1, welding transformer, cooling system, gas storage system and other subsystems, checks whether the power supply, gas source, water source and other connections are normal, and completes the portable flexible riveting mechanism self-inspection;

[0060] 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 downward toward 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 jointly press the plates. The power unit 1.1 drives the punch 1.5 and the positive electrode copper tube 1.4 to continue to impact the rivet 6 until the upper part of the rivet 6 is deformed by riveting. During the riveting process, the positive electrode copper tube 1.4 always keeps in contact with the rivet 6, completing the self-piercing riveting process.

[0061] like Figure 5 As shown, after the rivet 6 of this embodiment is riveted to the aluminum alloy plate 7 and the steel plate 8, the upper part of the rivet 6 is deformed by riveting, and the lower part is pressed into the steel plate 8 but does not penetrate the steel plate 8.

[0062] 3. After riveting is completed, the control system automatically switches to the spot welding mode, the positive electrode copper tube 1.4 and the negative electrode copper tube 1.6 are powered by the welding transformer, the rivet 6 is heated for resistance spot welding, and the self-riveting connection strength is enhanced by welding the rivet 6 with the aluminum alloy plate 7 and the steel plate 8;

[0063] In this embodiment, since the lower part of the rivet 6 is not deformed and is located inside the steel plate 8, there is no protruding welding point on the bottom surface of the steel plate 8 after welding, which can avoid the generation of gaps between the steel plate 8 and the parts connected thereto, and will not cause problems such as poor stability of the equipment after welding and increased equipment volume;

[0064] 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 of the welding point is always within a safe range. At the same time, the gas storage system sprays protective gas to the welding point, and the control system monitors various parameters in real time to ensure the welding quality and the safety of the convenient flexible riveting mechanism.

[0065] Although the principles of the present invention are described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely explanations of the exemplary implementations of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention, and any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, fall within the protection scope of the present invention.

Claims

1. A portable flexible riveting mechanism, characterized in that: The riveting mechanism comprises a resistance spot welding assisted self-piercing riveting device (1), a universal adjustment arm (2), and a flexible connection device (4); The resistance spot welding assisted self-piercing riveting device (1) comprises 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-shaped frame (1.8); The punch (1.5) is installed at the upper end of the opening of the C-shaped frame (1.8) through the lifting assembly, and the positive electrode copper tube (1.4) and the boss (1.3) are coaxially arranged in sequence from the inside to the outside at the lower part of the circumference of the punch (1.5); the lifting assembly drives the boss (1.3) and the positive electrode copper tube (1.4) to move up and down through the punch (1.5); The rivet conveying structure (1.2) is installed above the C-shaped frame (1.8) and is used to convey the rivet (6) to below the punch (1.5); The die (1.7) is fixed at the open lower end of the C-shaped frame (1.8) and is located directly below the boss (1.3); the die (1.7) and the boss (1.3) together form a work surface; the negative electrode copper tube (1.6) is coaxially arranged on the outside of the die (1.7); the punch (1.5) drives the rivet (6) to press downward, and after the riveting is completed, the resistance spot welding auxiliary 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, and resistance spot welding is performed; The flexible connection device (4) comprises a support column (4.4), a suspension arm (4.5), and a rotary bearing assembly (4.9); the suspension arm (4.5) is mounted on the upper part of the support column (4.4) via the rotary bearing assembly (4.9); and the C-shaped frame (1.8) is connected to the suspension arm (4.5) via the universal adjustment arm (2).

2. The portable flexible riveting mechanism according to claim 1, characterized in that: The rivet conveying structure (1.2) comprises a rivet storage structure and a conveying structure; the rivet storage structure conveys the rivets (6) in the rivet storage structure to below the punch 1.5 via the conveying structure.

3. The portable flexible riveting mechanism according to claim 1, characterized in that: The flexible connection device (4) also includes a pulley assembly (4.7); a sliding track is provided on the suspension arm (4.5); the pulley assembly (4.7) is slidably mounted on the sliding track; and the upper end of the universal adjustment arm (2) is connected to the pulley assembly (4.7) via a steel wire rope.

4. The portable flexible riveting mechanism according to claim 1, characterized in that: The portable flexible riveting mechanism further comprises a control cable (3) and an auxiliary system (5); the auxiliary system (5) comprises a welding transformer and a power supply cabinet; the power supply cabinet is connected to the welding transformer, and the welding transformer is respectively connected to the positive electrode copper tube (1.4) and the negative electrode copper tube (1.6) through the control cable (3); the welding transformer converts the current transmitted by the power supply cabinet into the required welding current, and then transmits it to the current loop formed by the positive electrode copper tube (1.4) and the negative electrode copper tube (1.6); At the same time, the power supply cabinet is connected to the lifting assembly and the rivet conveying structure (1.2) respectively through the control cable (3), and supplies power to the lifting assembly and the rivet conveying structure (1.2).

5. The portable flexible riveting mechanism according to claim 4, characterized in that: The sliding assembly (4.7) is composed of two pulleys; the two pulleys are respectively slidably mounted on the sliding track; the outer pulley is connected to the steel wire rope connected to the universal adjustment 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 portable 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 portable flexible riveting mechanism according to claim 1, characterized in that: The rotary bearing assembly (4.9) comprises an upper bearing, a lower bearing, a connecting rod and a mounting frame. The two mounting frames are fixed on the support column (4.4) at an upper and lower interval. The upper and lower ends of the connecting rod are respectively mounted on the mounting frame via the upper bearing and the lower bearing. The suspension arm (4.5) is connected to the connecting rod.

8. The portable flexible riveting mechanism according to claim 7, characterized in that: An intermediate disk is installed in the middle of the connecting rod; the connecting rod between the intermediate disk and the lower bearing is connected to the suspension arm (4.5); the connecting rod between the intermediate disk and the upper bearing is connected to the suspension arm (4.5) through a steel wire rope (4.6); the flexible connection device (4) also includes a limit block (4.10) and a stop block (4.11); two limit blocks (4.10) are installed on the intermediate disk at intervals horizontally; the stop block (4.11) is installed on the support column (4.4); when the limit block (4.10) contacts the stop block (4.11), the suspension arm (4.5) is prevented from continuing to rotate.

9. The portable flexible riveting mechanism according to claim 1, characterized in that: The flexible connection device (4) also includes a base platform (4.1), universal wheels (4.2), and telescopic support legs (4.3); the support column (4.4) is fixed in the middle of the base platform (4.1); a plurality of universal wheels (4.2) are evenly distributed below the base platform (4.1); the telescopic support legs (4.3) are respectively installed at two ends of opposite sides of the base platform (4.1), and the telescopic support legs (4.3) are adjusted in length horizontally and in height vertically according to ground conditions to keep the base platform (4.1) balanced.

10. The portable flexible riveting mechanism according to claim 1, characterized in that: The plurality of suspension arms (4.5) are evenly distributed around the circumference of the support column (4.4) and are respectively mounted on the support column (4.4) via the rotary bearing assembly (4.9).

Images