A welding device suitable for a car support skeleton

Abstract

The application discloses a welding device suitable for a car supporting framework and relates to the technical field of welding devices.The welding device comprises a welding table, a positioning unit, a robot and a welding unit, the positioning unit is installed on the welding table, the welding unit comprises a fixing frame, the fixing frame is installed at the tail end of the robot, flexible contact pieces are arranged at the two ends of the fixing frame, clamping pieces are slidably installed at the positions corresponding to the flexible contact pieces of the fixing frame, the clamping pieces are connected with the output ends of linear moving mechanisms, the flexible contact pieces and the clamping pieces are matched to realize stable clamping of different welding guns, force elements are arranged on the flexible contact pieces, the flexible contact pieces can be deformed to adapt to the outer contour of the welding gun, the clamping contact area is increased, the clamping force can be accurately controlled, the welding gun of different outer shapes and specifications can be adapted, surface damage of the welding gun caused by rigid clamping is avoided, and the technical problems of poor adaptability of a traditional clamping mechanism, uncontrollable clamping force and easy damage of the welding gun are solved.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically a welding device suitable for automotive support frames. Background Technology

[0002] The vehicle support frame is the core structural component that constitutes the vehicle body load-bearing system. It is usually made of longitudinal beams, transverse beams, reinforcing plates, and various bracket components formed by stamping high-strength steel plates and connected by welding. During vehicle operation, it bears multi-directional alternating loads such as bending, torsion, and collision.

[0003] Existing automotive support frame welding devices mostly employ welding torch clamping mechanisms with fixed aperture blocks or single clamp structures. These clamping methods are fixed and can only accommodate welding torches of specific specifications and models, resulting in poor universal compatibility. In actual production, for frame components of different sizes and weld seam structures with different orientations, it is often necessary to change welding torches and welding heads of different diameters or shapes according to process requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device suitable for automotive support frames, in order to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding device suitable for automobile support frame, comprising a welding table, a positioning unit, a robot, and a welding unit, wherein the positioning unit is mounted on the welding table; The welding unit includes a fixed frame, which is installed at the end of the robot. Flexible contact elements are provided at both ends of the fixed frame. Clamping elements are slidably installed on the fixed frame at positions corresponding to the flexible contact elements. The clamping elements are connected to the output end of a linear motion mechanism, which is installed on the fixed frame. The flexible contact elements and clamping elements cooperate to achieve stable clamping of different welding torches. The flexible contact is provided with a force measuring element, which is electrically connected to the control system.

[0006] The linear motion mechanism consists of devices such as electric telescopic rods or electric poles that can output linear driving force, and is connected to the control system. The positioning unit comprises several clamping cylinders or a manual clamping structure, used for positioning and locking the automotive support frame. The robot is a multi-degree-of-freedom industrial robot used to drive the welding unit to complete welding movements within space.

[0007] The welding unit also includes two sets of vision units. These vision units are devices or equipment capable of acquiring image data, such as CCD cameras and image sensors. One set of vision units is mounted on a fixed frame to acquire images of the weld seam and feeds the acquired image data back to the control system, providing visual guidance for robot welding path planning. The other set of vision units is mounted on a ground-based or external frame to detect the welding unit's movement and vibration data, feeding this data back to the control system to provide data support for welding torch status adjustment. After the welding torch is clamped, the external vision unit can perform image recognition on the torch, extract the current center position coordinates of the torch, and feed them back to the control system. The control system automatically updates the torch tool parameters and calibrates the welding reference, eliminating positional deviations caused by torch changing and clamping. This eliminates the need for manual teaching and alignment, shortening torch changing and debugging time.

[0008] Before starting work, the welding torch needs to be clamped. The control system controls the linear movement mechanism to move the clamping part away from the flexible contact part so that the distance between the clamping part and the flexible contact part can accommodate the welding torch. Then, the operator places the welding torch in the position between the two and then uses the linear movement mechanism to move the clamping part closer to the flexible contact part to position and clamp the welding torch.

[0009] After the welding torch is positioned and clamped, the staff places the frame on the welding table and positions the frame using the positioning unit to facilitate welding.

[0010] During operation, the control system moves the fixed frame via the robot, which in turn moves the welding torch held in place. Through the cooperation of the robot and the fixed frame, the welding of the skeleton is achieved.

[0011] The clamping member includes a clamping ring, the clamping ring having a "C" shaped cross-section, and both ends of the clamping ring being connected to the output end of a linear motion mechanism; The fixing frame is provided with a sliding groove at the position of the clamping ring, and the two ends of the clamping ring are slidably installed in the sliding groove.

[0012] The "C"-shaped clamping ring increases the contact area with the welding torch and provides lateral stopping capability to prevent the welding torch from slipping when subjected to lateral interference forces such as welding spatter and cable dragging. The linear movement mechanism with independent drive and synchronous control at both ends can smoothly advance the clamping ring, avoiding uneven load jamming caused by unilateral force application, and can gradually guide the welding torch that is placed at an angle, making the clamping action smoother.

[0013] The clamping component includes a clamping ring and a connecting unit. The clamping ring has a "C" shaped cross-section. The connecting unit is composed of several connecting plates that are rotatably connected. The connecting plates at both ends are rotatably mounted with sliding shafts, and the sliding shafts are connected to the output end of a linear motion mechanism. The fixing frame is provided with a sliding groove at the position corresponding to the clamping ring, and the sliding shaft is slidably installed in the sliding groove.

[0014] The linear movement mechanism drives the connecting unit to move through the sliding shaft, so that multiple connecting plates retract and fit together with the outer contour of the welding torch, forming multi-point clamping on the outside of the welding torch, which further improves the stability of the welding torch clamping.

[0015] The clamping ring is equipped with an elastic pad. The elastic pad can prevent surface damage caused by hard contact between the clamping structure and the welding torch, while increasing the contact friction and improving the clamping stability; the compressibility of the elastic pad can also accommodate the slight shape deviation of the welding torch, further improving the adaptability of the device.

[0016] One end of the chute is inclined toward the welding torch. The inclined chute can drive the connecting unit and the clamping ring to retract and cover the welding torch side during the movement of the sliding shaft, increasing the contact area with the welding torch and enhancing the clamping effect.

[0017] The flexible contact component includes a flexible element, and the force-measuring element is disposed on the flexible element. The flexible element is filled with fluid. When the clamping component presses the welding torch against the flexible element, the internal fluid allows the flexible element to adaptively conform to the outer contour of the welding torch, increasing the contact area and uniformly transmitting the clamping force, thus avoiding localized stress concentration. The force-measuring element can accurately collect clamping pressure data, providing a basis for closed-loop control of the control system. During welding, the force-measuring element continuously monitors the clamping force status. If the clamping force fluctuates due to mechanical vibration or thermal effects, the control system can respond and adjust in real time to ensure that the welding torch is always in a stable positioning state.

[0018] The flexible component has several anti-slip protrusions, and the anti-slip protrusions form cavities inside, which are connected to the interior of the flexible component.

[0019] A rotating platform is installed at the bottom of the welding table, and the rotating platform is electrically connected to the control system. The rotating platform can drive the welding table to rotate and switch workstations. When welding is being performed on one workstation, the other workstation can simultaneously complete loading, unloading, and clamping, converting the robot's waiting time into effective operating time and improving the overall processing efficiency of the equipment.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. Precise control of clamping force, adaptable to welding torches of different shapes and sizes. A linear motion mechanism drives the clamping component to slide along the fixed frame, engaging with a flexible contact component to clamp the welding torch. A force-measuring element on the flexible contact component collects the clamping force in real time and feeds it back to the control system. The control system dynamically adjusts the output thrust of the linear motion mechanism, forming a closed-loop control of the clamping force. The flexible contact component can adaptively deform according to the outer contour of the welding torch, increasing the clamping contact area. This structure allows for precise control of clamping force, adapting to welding torches of different shapes and sizes, avoiding surface damage to the welding torch caused by rigid clamping, and solving the technical problems of poor adaptability, uncontrollable clamping force, and easy damage to the welding torch in traditional clamping mechanisms.

[0021] 2. Dual-vision collaboration enables precise end-to-end control. Two sets of vision units are set up: a vision unit mounted on the fixed frame acquires weld seam images, providing visual guidance for robot welding path planning; a vision unit mounted on the external frame monitors the movement and vibration data of the welding torch in real time, providing data support for clamping force adjustment and magnetic field vibration suppression. The two sets of vision units work together, covering both weld seam recognition and welding torch status monitoring, enabling the control system to simultaneously complete path guidance and status adjustment, solving the technical problems of insufficient data from a single detection dimension and delayed response in welding process control. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the fixing frame in this invention; Figure 3 This is a schematic diagram of the linear motion mechanism in this invention; Figure 4 This is a schematic diagram of the flexible contact element in this invention; Figure 5 This is a schematic diagram of the clamping cover in this invention; Figure 6 This is a schematic diagram of the connection unit in this invention; Figure 7 This is a schematic diagram of the elastic pad structure in this invention.

[0023] In the diagram: 1. Welding table; 11. Rotating platform; 2. Positioning unit; 3. Robot; 4. Welding unit; 41. Fixing frame; 42. Flexible contact element; 421. Flexible element; 43. Clamping element; 431. Clamping ring; 4311. Elastic pad; 432. Connecting unit; 433. Clamping cover; 44. Linear movement mechanism. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-3 As shown in the first embodiment of the present invention, a welding device suitable for automobile support frames is provided.

[0026] The specific content of Embodiment 1 is as follows: It includes a welding table 1, a positioning unit 2, a robot 3, and a welding unit 4. The positioning unit 2 is installed on the welding table 1. The welding unit 4 includes a fixing frame 41, which is installed at the end of the robot 3. Flexible contact members 42 are provided at both ends of the fixing frame 41. Clamping members 43 are slidably installed on the fixing frame 41 corresponding to the positions of the flexible contact members 42. The clamping members 43 are connected to the output end of the linear motion mechanism 44, which is installed on the fixing frame 41. A force measuring element is provided on the flexible contact member 42, and the force measuring element is electrically connected to the control system. A rotating platform 11 is installed at the bottom of the welding table 1, and the rotating platform 11 is electrically connected to the control system.

[0027] The welding station 1 has at least two workstations. The rotating platform 11 can drive the welding station 1 to rotate so that the skeletons on the workstations can be welded in sequence. While one side is welding, the other side can be manually loaded or clamped at the same time, which transforms the waiting time of the robot 3 into effective manual operation time and significantly improves the overall efficiency of the equipment.

[0028] Welding unit 4 also includes two sets of vision units (not shown in the figure). The vision units are devices or equipment such as CCD cameras and image sensors that can acquire image data. One set of vision units is installed on the fixed frame 41 to acquire images of the weld and feed the acquired image data back to the control system. The other set of vision units is installed on the ground or on an external frame to detect the movement data, vibration data and image data of welding unit 4 and feed the movement data, vibration data and image data back to the control system.

[0029] In this embodiment, the flexible contact 42 is a rubber plate, and the clamping member 43 is a clamping plate. The rubber plate can increase friction to prevent slipping and can also elastically deform to fit the surface of the welding torch. With the real-time feedback of the pressure sensor, the control system can accurately control the clamping force, which can avoid damaging the welding torch shell and prevent welding vibration from causing the welding torch to shift slightly.

[0030] In this embodiment, the linear movement mechanism 44 is an electric telescopic rod structure or an electric rod structure.

[0031] In this embodiment, the force measuring element is a pressure sensor. The pressure sensor detects the clamping force and feeds the clamping force data back to the control system.

[0032] In this embodiment, the positioning unit 2 consists of several clamping cylinders or manual clamping structures, all of which are mounted on the welding table 1.

[0033] In this embodiment, robot 3 is a multi-degree-of-freedom industrial robot, which is mounted on the ground or on an external frame.

[0034] The working steps of this embodiment are as follows: Before starting work, the welding torch needs to be clamped. The control system controls the linear movement mechanism 44 to move the clamping part 43 away from the flexible contact part 42 so that the distance between the clamping part 43 and the flexible contact part 42 can accommodate the welding torch. Then, the operator places the welding torch in the position between the two and then uses the linear movement mechanism 44 to move the clamping part 43 closer to the flexible contact part 42 to position and clamp the welding torch.

[0035] After the welding torch is clamped, robot 3 moves the fixing frame 41, which in turn moves the clamped welding torch to the underside of the vision unit. The vision unit captures and recognizes the welding torch, accurately extracting the current center position coordinates of the welding torch and feeding this data back to the control system in real time. The control system uses this measured center position to automatically update the tool parameters of the welding torch, thereby calibrating the reference of the welding program and avoiding changes in welding data caused by clamping deviations due to changing the welding torch, ensuring the accuracy of the welding trajectory. The mechanical error of manual torch changing is automatically compensated by vision and becomes the digital reference of the control system, eliminating the need for manual teaching or alignment, and significantly shortening the debugging time after torch changing.

[0036] After the welding torch position is calibrated, the staff places the skeleton to be welded on the welding table 1 and locks the skeleton in place using the positioning unit 2, preparing it for welding.

[0037] During welding, the control system moves the fixed frame 41 via the robot 3, and the fixed frame 41 moves the welding torch held in place. Through the cooperation of the robot 3 and the fixed frame 41, the welding of the skeleton is achieved.

[0038] After the skeleton welding is completed, the rotating platform 11 drives the welding table 1 to rotate, so that the skeleton on the other side of the welding table 1 is rotated to the welding station and welded.

[0039] like Figure 4 As shown, in Embodiment 2 of the present invention, the design is further optimized based on Embodiment 1, and a specific implementation of the clamping member 43 is provided. The contact area with the welding gun is increased by the "C"-shaped clamping ring 431, thereby improving the clamping effect and stability.

[0040] The specific details of Embodiment 2 are as follows: The clamping member 43 includes a clamping ring 431, the cross-section of which is "C" shaped; when the welding torch is subjected to lateral interference forces such as welding spatter and cable dragging, the concave arc surface of the "C" shape can provide stronger lateral stopping ability than flat plate clamping, preventing the welding torch from slipping laterally from the clamping position; both ends of the clamping ring 431 are connected to the output end of the linear movement mechanism 44; the fixing frame 41 is provided with a sliding groove corresponding to the position of the clamping ring 431, and both ends of the clamping ring 431 are slidably installed in the sliding groove.

[0041] In this embodiment, the groove is a straight groove, and lubricating grease is applied inside the straight groove to reduce the sliding friction of the clamping ring 431 and extend the service life of the clamping ring 431.

[0042] In this embodiment, the clamping ring 431 is C-shaped in the middle and has long strip-shaped structures at both ends. The clamping ring 431 slides in the groove through the long strip-shaped structures at both ends. A return spring (not shown in the figure) is connected between the long strip-shaped structures at both ends of the clamping ring 431 and the groove. The C-shaped clamping ring 431 increases the contact area with the welding torch, improving the clamping effect and stability. The return spring buffers the movement of the clamping ring 431.

[0043] In this embodiment, the linear movement mechanism 44 is an electric telescopic rod structure or an electric rod structure.

[0044] The clamping ring 431 is moved by the linear movement mechanism 44 at both ends. The two ends of the clamping ring 431 are driven independently but synchronously under control, avoiding the jamming caused by unilateral force application. Even if the welding torch is slightly tilted when placed, the "C"-shaped clamping ring 431 can gradually "guide" the welding torch and press it against the flexible contact 42 under the balanced power advancement at both ends, making the clamping action smoother.

[0045] The working steps of this embodiment are as follows: Before operation, the two sets of linear motion mechanisms 44 drive the long strip structures at both ends of the clamping ring 431 to slide in the corresponding grooves, so that the clamping ring 431 is away from the flexible contact 42. At the same time, the clamping ring 431 stretches the return spring to ensure that the distance between the clamping ring 431 and the flexible contact 42 can accommodate the welding torch. After that, the operator places the welding torch between the clamping ring 431 and the flexible contact 42.

[0046] During operation, the two sets of linear movement mechanisms 44 respectively drive the clamping ring 431 to approach the flexible contact member 42, so that the clamping ring 431 presses the welding torch on the flexible contact member 42, thereby achieving the positioning of the welding torch to facilitate welding operations, and the return spring resets at the same time.

[0047] like Figures 5-7As shown, in Embodiment 3 of the present invention, the design is further optimized based on Embodiment 1, and a clamping component 43 different from that in Embodiment 2 is provided. The welding gun is clamped by several rotating connecting plates, which further improves the clamping effect and stability.

[0048] The specific content of Embodiment 3 is as follows: The clamping member 43 includes a clamping ring 431 and a connecting unit 432. The clamping ring 431 has a "C" shaped cross section. The connecting unit 432 is composed of several connecting plates that are rotatably connected. The connecting plates at both ends are rotatably mounted with sliding shafts. The sliding shafts are connected to the output end of the linear motion mechanism 44. The fixed frame 41 is provided with a sliding groove corresponding to the position of the clamping ring 431. The sliding shaft is slidably installed in the sliding groove.

[0049] The clamping member 43 in this embodiment also includes a clamping cover 433, which is mounted on a fixing frame 41 at the position corresponding to the clamping ring 431. The clamping cover 433 is located outside the clamping ring 431, and a spring (not shown in the figure) is connected between the clamping ring 431 and the clamping cover 433. The clamping cover 433 restricts the position of the connecting unit 432 and cooperates with the spring to form a semi-circular structure with the connecting unit 432 and the clamping ring 431. The welding gun is clamped by the semi-circular structure. Since multiple connecting plates are in contact with the outside of the welding gun, multiple connecting plates form multiple clamping points on the outside of the welding gun to improve the stability of the welding gun clamping.

[0050] As a further optimization design, the side of the clamping ring 431 and several clamping plates that contacts the welding gun is made of elastic material, thereby improving the clamping effect.

[0051] The working steps of this embodiment are as follows: In the initial state, the spring pulls the clamping ring 431 away from the flexible contact 42 so that the distance between the clamping ring 431 and the flexible contact 42 can accommodate the welding torch. Then, the operator places the welding torch between the clamping ring 431 and the flexible contact 42.

[0052] During operation, the two sets of linear motion mechanisms 44 drive the two sliding shafts to slide in the groove. The two sliding shafts drive the clamping ring 431 to approach the welding gun through several connecting plates. The clamping ring 431 drives the welding gun to press against the flexible contact member 42. The several connecting plates converge toward the outer surface of the welding gun and increase the contact area to improve the stability of the welding gun clamping.

[0053] like Figure 7As shown, in Embodiment 4 of the present invention, the design is further optimized based on Embodiment 2 or Embodiment 3. An elastic pad 4311 is provided on the clamping ring 431, and an elastic rubber sleeve (not shown in the figure) is provided on the side of several connecting plates that contacts the welding gun. The rubber sleeve is elastic. The elastic pad 4311 and the elastic rubber sleeve prevent the clamping ring 431 and several connecting plates from damaging the welding gun during clamping, and increase the contact area between them and the welding gun, avoid excessive local pressure, and improve the clamping effect.

[0054] The specific content of Embodiment 4 is as follows: An elastic pad 4311 is provided on the clamping ring 431.

[0055] As a further optimization design, the side of the elastic pad 4311 that contacts the welding torch is provided with several anti-slip teeth or anti-slip protrusions to increase the friction between the elastic pad 4311 and the welding torch and prevent the welding torch from sliding when clamped.

[0056] like Figures 6-7 As shown, Embodiment 5 of the present invention further optimizes the design based on Embodiment 2 or Embodiment 3, and provides a specific implementation of a sliding groove so that several connecting plates can cover the welding gun, increase the contact area with the welding gun, and thus improve the clamping effect.

[0057] The specific content of Example 5 is as follows: one end of the chute is inclined towards the welding gun.

[0058] like Figures 5-7 As shown, in Embodiment Six of the present invention, a specific implementation of a flexible contact member 42 is provided. The flexible member 421 is filled with fluid, and the pressure transmission characteristics of the fluid are used to achieve uniform clamping and precise force measurement.

[0059] The specific content of Embodiment Six is ​​as follows: The flexible contact member 42 includes a flexible member 421, a force measuring element is disposed on the flexible member 421, and the flexible member 421 is filled with fluid; a plurality of anti-slip protrusions are provided on the flexible member 421, and cavities are formed inside the anti-slip protrusions, and the cavities are connected to the interior of the flexible member 421.

[0060] In this embodiment, the flexible element 421 is an elastic capsule with a sealed cavity filled with fluid, which can be hydraulic oil or inert gas. A force-measuring element is embedded inside the flexible element 421 or attached to its surface in contact with the welding torch, used to detect pressure during the clamping process. When the clamping element 43 presses the welding torch against the flexible element 421, the fluid inside the flexible element 421 causes the capsule to adaptively conform to the outer surface of the welding torch, increasing the contact area and simultaneously transmitting the clamping force evenly to the force-measuring element, avoiding localized stress concentration. The force-measuring element feeds back the real-time pressure signal to the control system. The control system adjusts the thrust of the linear motion mechanism 44 according to a preset clamping force threshold, forming a closed-loop control of the clamping force to ensure that the welding torch is clamped securely without damage.

[0061] As a further optimization design, a vibration sensor is installed on the mounting bracket 41 to detect the vibration of the welding torch or robot 3, and works with the vision unit to feed the vibration data of the welding torch back to the control system.

[0062] The working steps of this embodiment are as follows: Before starting work, position the welding torch between the flexible part 421 and the clamping part 43.

[0063] During operation, the linear motion mechanism 44 drives the clamping member 43 to move towards the flexible member 421 and press against the welding torch. The flexible member 421 is compressed, causing internal fluid to flow and uniformly transmit pressure. The force measuring element detects the clamping force in real time and feeds it back to the control system. The control system compares the detected value with a preset target value and dynamically adjusts the output thrust of the linear motion mechanism 44 until the clamping force stabilizes within the set range. During welding, the force measuring element continuously monitors the process. If the clamping force fluctuates due to mechanical vibration or thermal effects, the control system responds immediately to ensure the welding torch maintains a stable positioning.

[0064] like Figures 5-7 As shown, Embodiment Seven of the present invention further optimizes the design based on Embodiment Six, providing an active balancing system for the entire welding process. It combines the magnetofluid and magnetic field generator within the flexible component 421 with the vision unit mounted on the external frame to form a closed-loop active balancing system. Differentiated control strategies are implemented for two different stages: the welding torch movement process and the welding process. This not only solves the problem of not being able to adaptively fit the curved surface of the welding torch when not welding, but more importantly, it solves the technical problem of welding torch vibration and reduced welding quality caused by the lack of active vibration suppression methods during movement and welding.

[0065] The specific content of Embodiment 7 is as follows: the fluid is a magnetorheological fluid, and the magnetorheological fluid is a magnetorheological fluid. A magnetic field generator (not shown in the figure) is provided at the position of the fixed frame 41 corresponding to the flexible part 421. The magnetic field generator is electrically connected to the control system.

[0066] When clamping the welding torch, the operator places the welding torch between the clamping member 43 and the flexible member 421. At this time, the magnetic field generator is in a de-energized or low-current state, the magnetofluid is in a low-viscosity liquid state, and the flexible member 421 is in a soft and easily deformable state. Then, the linear movement mechanism 44 drives the clamping member 43 to move towards the flexible member 421, pressing the welding torch onto the flexible member 421. Under the action of the clamping force, the flexible member 421 conforms to the outer surface of the welding torch to adapt to welding torches of different diameters or shapes.

[0067] When the robot 3 moves the welding torch after it is clamped, the vision unit installed on the external frame monitors the shaking amplitude of the welding torch in real time, and the control system compares it with the set data. If the shaking data exceeds the set data, the control system adjusts the magnitude of the magnetic field generated by the magnetic field generator, thereby changing the viscosity or elastic modulus of the magnetofluid inside the flexible part 421, so that the flexible part 421 as a whole exhibits different softness and hardness to absorb minor vibrations and ensure the stability of the welding torch.

[0068] If the shaking data does not exceed the set data, the control system maintains the current current of the magnetic field generator unchanged, and the flexible part 421 maintains the current stiffness state, so that the welding torch moves smoothly while avoiding unnecessary energy consumption.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A welding device suitable for automotive support frames, characterized in that: It includes a welding table (1), a positioning unit (2), a robot (3) and a welding unit (4), wherein the positioning unit (2) is mounted on the welding table (1); The welding unit (4) includes a fixed frame (41), which is installed at the end of the robot (3). Flexible contact elements (42) are provided at both ends of the fixed frame (41). A clamping element (43) is slidably installed on the fixed frame (41) corresponding to the position of the flexible contact element (42). The clamping element (43) is connected to the output end of a linear motion mechanism (44). The linear motion mechanism (44) is installed on the fixed frame (41). The flexible contact element (42) and the clamping element (43) cooperate to clamp different welding guns. The flexible contact (42) is provided with a force measuring element, which is electrically connected to the control system.

2. The welding device for an automobile support frame according to claim 1, characterized in that: The clamping member (43) includes a clamping ring (431), the clamping ring (431) has a "C" shaped cross section, and both ends of the clamping ring (431) are connected to the output end of the linear motion mechanism (44); The fixing frame (41) is provided with a sliding groove corresponding to the position of the clamping ring (431), and the two ends of the clamping ring (431) are slidably installed in the sliding groove.

3. The welding device for an automobile support frame according to claim 1, characterized in that: The clamping member (43) includes a clamping ring (431) and a connecting unit (432). The clamping ring (431) has a "C" shaped cross section. The connecting unit (432) is composed of several connecting plates that are rotatably connected. The connecting plates at both ends are rotatably mounted with sliding shafts. The sliding shafts are connected to the output end of a linear motion mechanism (44). The fixing frame (41) is provided with a sliding groove at the position corresponding to the clamping ring (431), and the sliding shaft is slidably installed in the sliding groove.

4. A welding device suitable for automotive support frames according to claim 2 or 3, characterized in that: An elastic pad (4311) is provided on the clamping ring (431).

5. A welding device suitable for automotive support frames according to claim 2 or 3, characterized in that: One end of the chute is inclined toward the welding gun.

6. The welding device for an automobile support frame according to claim 1, characterized in that: The flexible contact (42) includes a flexible element (421), the force measuring element is disposed on the flexible element (421), and the flexible element (421) is filled with fluid.

7. A welding device suitable for automotive support frames according to claim 6, characterized in that: The flexible component (421) is provided with a plurality of anti-slip protrusions, and the anti-slip protrusions form cavities inside, which are connected to the interior of the flexible component (421).

8. The welding device for an automobile support frame according to claim 1, characterized in that: The bottom of the welding table (1) is equipped with a rotating platform (11), which is electrically connected to the control system.

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