Multi-angle positioning device for automobile seat framework welding

Abstract

The utility model discloses a kind of multi-angle positioning devices for automobile seat framework welding, it is related to automobile parts welding tooling technical field;The support seat includes welding table, three sets of radial expansion positioning unit and intelligent control system;Its innovation point is at: three circular channels are equipped on welding table, and mounting plate of independent lifting is installed in passageway through slide rail and gear rack mechanism;Radial expansion positioning unit is integrally installed on mounting plate, including guide tube, stop ring, half tooth screw, petal nut and driving motor;Intelligent control system controls three lifting motors and three pressing motors respectively, and realizes self-adaptive clamping force control by current feedback;The utility model realizes the electric stepless regulation of seat framework space posture and intelligent flexible clamping, significantly improves welding accessibility, quality and production efficiency, while effectively prevents workpiece bruise.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to automotive parts manufacturing technology, specifically a multi-angle positioning device for welding automotive seat frames. Background Technology

[0002] The automotive seat frame is a critical structural component related to driving safety, and its manufacturing quality requirements are extremely high. Currently, seat frames are generally welded using specialized welding fixtures. Because these fixtures are mostly rigid structures designed for specific product models, they have the following significant drawbacks: First, the fixture's fixed posture makes it difficult for the welding torch to reach welds inside the frame or at specific angles, affecting welding quality and efficiency. Second, traditional fixtures mainly rely on cylinders or manual clamps to provide clamping force, making it difficult to guarantee consistent clamping force. Excessive force can easily cause deformation of thin-walled frames, while insufficient force may cause displacement under welding thermal stress, resulting in welding defects. Furthermore, specialized fixtures have extremely low versatility and cannot adapt to the flexible production needs of multiple varieties and small batches. When changing product models, the entire set of fixtures must be replaced, resulting in high costs and long lead times.

[0003] Therefore, developing an intelligent welding support system that can flexibly adjust the spatial posture of the skeleton and precisely control the clamping force is of great significance for improving the process level, quality and efficiency of automotive seat manufacturing. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing welding fixtures, such as rigid fixation, uncontrollable clamping force, and lack of flexibility, by providing a multi-angle positioning device for welding automotive seat frames. This device aims to achieve electric adjustment of the seat frame's pitch, tilt, and other multi-degree-of-freedom postures in space, and to achieve precise adaptive control of the clamping force through an intelligent control algorithm based on current feedback, thereby providing ideal process equipment for high-quality, high-efficiency, and flexible welding production.

[0005] To achieve the above objectives, this utility model provides a multi-angle positioning device for welding automotive seat frames. It includes a horizontally positioned welding table with three triangularly arranged circular channels. Each circular channel contains a liftable mounting plate. A linear slide rail is longitudinally fixed to the inner wall of each circular channel, and the side wall of the mounting plate slides against the linear slide rail. A rack is also fixedly mounted to the side wall of the mounting plate. A lifting motor is installed on the side wall of the welding table corresponding to the position of each circular channel. The output shaft of the lifting motor is connected to a gear, which meshes with the rack. Each mounting plate is equipped with a radial expansion positioning unit. The radial expansion positioning unit includes a guide tube vertically fixed to the mounting plate, and a stop ring is fixedly mounted at the upper end of the guide tube. A main engagement tooth is fixedly installed on the outer periphery of the guide tube, above the stop ring; a semi-threaded screw is inserted into the guide tube, the semi-threaded screw consisting of a lower optical shaft and an upper threaded shaft, the lower optical shaft passing through the guide tube and the mounting plate and extending to the bottom of the mounting plate, a clamping motor is installed below the mounting plate, and the end of the lower optical shaft is connected to the output hole of the clamping motor; the upper threaded shaft is located above the guide tube, and a petal nut is fitted on the upper threaded shaft, the lower end face of the petal nut being provided with a secondary engagement tooth that meshes with the main engagement tooth; the upper part of the petal nut has several evenly distributed slits axially formed to create multiple elastic petals; it also includes an intelligent control system, which is electrically connected to three lifting motors and three clamping motors simultaneously.

[0006] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein the intelligent control system is based on a multi-axis motion controller or a programmable logic controller to control the position of the three lifting motors and the torque of the three clamping motors; the system monitors the operating current of each clamping motor in real time, and when the current of any clamping motor reaches a preset safe clamping force threshold, it controls the motor to stop running and brake.

[0007] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein the lifting motor and the pressing motor are both servo motors or stepper motors with braking functions.

[0008] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein a reinforcing rib is provided at the connection between the mounting plate and the guide tube.

[0009] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein the stop ring is a replaceable annular component.

[0010] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein the main biting teeth and the secondary biting teeth are mutually matched end-face ratchet teeth.

[0011] Furthermore, this utility model provides a multi-angle positioning device for welding automotive seat frames, wherein the petal nut is made of spring steel.

[0012] This utility model provides a multi-angle positioning device for welding automotive seat frames, which has the following advantages compared to existing technologies:

[0013] 1. Superior welding processability: Through electric posture adjustment, the weld can be placed in the most ideal flat welding or boat-shaped welding position, which greatly improves the accessibility of the welding torch, significantly enhances welding quality and operational safety, and reduces the labor intensity of workers;

[0014] 2. High flexibility and intelligence: A single system can be programmed to adapt to various product models and countless welding postures, achieving a leap from "dedicated tooling" to a "universal platform." Intelligent clamping control ensures the consistency and reliability of the clamping process;

[0015] 3. Effective workpiece protection: Torque control based on current feedback fundamentally eliminates skeleton deformation or indentation caused by overvoltage, protecting the surface quality and structural integrity of the workpiece, and is especially suitable for easily deformable materials such as high-strength steel and aluminum alloys;

[0016] 4. High precision and high rigidity: The combination of servo motors with precision gear racks and linear guides ensures the accuracy of attitude adjustment and positioning, while the overall reinforced structure ensures dynamic stability during welding under complex postures.

[0017] 5. Automation and Integration: The complex posture adjustment and clamping actions are integrated into a unified control system, realizing full-process automation, high production efficiency, and easy integration into automated welding production lines. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a multi-angle positioning fixture structure for welding automotive seat frames according to the present invention;

[0019] Figure 2 This is an exploded view of a multi-angle positioning fixture structure for welding automotive seat frames according to this utility model.

[0020] Figure 3 for Figure 2 Schematic diagram of the structure with changing perspective.

[0021] The components include: 1. Welding table; 2. Circular channel; 3. Mounting plate; 4. Linear slide rail; 5. Rack; 6. Lifting motor; 7. Gear; 8. Guide tube; 9. Stop ring; 10. Main engagement tooth; 11. Lower section optical shaft; 12. Upper section threaded shaft; 13. Pressing motor; 14. Secondary engagement tooth; 15. Elastic petals. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figures 1-3As shown, this embodiment provides a multi-angle positioning device for welding automotive seat frames, which includes a horizontally arranged welding table 1. The welding table 1 has three circular channels 2 arranged in a triangle. Each circular channel 2 has a liftable mounting plate 3 embedded within it. A linear slide rail 4 is longitudinally fixed to the inner wall of each circular channel 2, and the side wall of the mounting plate 3 slides in cooperation with the linear slide rail 4. A rack 5 is also fixedly installed on the side wall of the mounting plate 3. A lifting motor 6 is installed on the side wall of the welding table 1 corresponding to the position of each circular channel 2. The output shaft of the lifting motor 6 is connected to a gear 7, and the gear 7 meshes with the rack 5. Each mounting plate 3 is equipped with a radial expansion positioning unit. The radial expansion positioning unit includes a guide tube 8 vertically fixed to the mounting plate 3. A reinforcing rib is provided at the connection between the mounting plate 3 and the guide tube 8. A stop ring 9 is fixedly installed at the upper end of the guide tube 8. The stop ring 9 is a replaceable annular component. A main engagement tooth 10 is fixedly installed on the outer periphery of the guide tube 8, above the stop ring 9; a semi-threaded screw is inserted into the guide tube 8, the semi-threaded screw consisting of a lower optical shaft 11 and an upper threaded shaft 12, the lower optical shaft 11 passing through the guide tube 8 and the mounting plate 3 and extending to the bottom of the mounting plate 3, a clamping motor 13 is installed below the mounting plate 3, and the end of the lower optical shaft 11 is connected to the output hole of the clamping motor 13; the upper threaded shaft 12 is located on the guide tube Above the 8, a petal nut is fitted on the upper threaded shaft 12. The lower end face of the petal nut is provided with a secondary engagement tooth 14 that meshes with the main engagement tooth 10. The main engagement tooth 10 and the secondary engagement tooth 14 are matching end face ratchet teeth. The upper part of the petal nut has several evenly distributed slits to form multiple elastic petals 15. The petal nut is made of spring steel. The lifting motor 6 and the pressing motor 13 are both servo motors or stepper motors with braking function.

[0026] It also includes an intelligent control system, which is electrically connected to the three lifting motors 6 and the three clamping motors 13. The intelligent control system is based on a multi-axis motion controller or a programmable logic controller to control the position of the three lifting motors 6 and the torque of the three clamping motors 13. The system monitors the operating current of each clamping motor 13 in real time. When the current of any clamping motor 13 reaches a preset safe clamping force threshold, the system controls the motor to stop running and brake.

[0027] Example

[0028] This embodiment provides a multi-angle positioning device for welding automotive seat frames.

[0029] System Structure:

[0030] The welding table 1 serves as a base, on which three circular channels 2 are machined. Each circular channel 2 is equipped with a lifting mounting plate 3 via a linear slide rail 4. The rack 5 on the side wall of the mounting plate 3 meshes with a gear 7 driven by a lifting motor 6. The lifting motor 6 is a servo motor with a brake.

[0031] Each lifting mounting plate 3 is equipped with a complete radial expansion and positioning unit. The guide tube 8 is vertically fixed to the mounting plate 3 by reinforcing ribs. The stop ring 9 and main engagement teeth 10 on the guide tube serve as positioning and anti-rotation references. The lower section optical shaft 11 of the semi-threaded screw is supported in the guide tube 8 by bearings. The lower end is keyed to the output hole of the clamping motor 13. The petal nut is screwed onto the upper section threaded shaft 12 of the semi-threaded screw. The outer wall of its elastic petals 15 is the key to achieving radial expansion and tightening.

[0032] The intelligent control system adopts a multi-axis motion controller, which is connected to three lifting motors 6 and three pressing motors 13 through a driver;

[0033] Workflow:

[0034] Phase 1: Horizontal feeding

[0035] 1. System initialization: The three sets of lifting mounting plates 3 descend to their initial horizontal positions;

[0036] 2. The operator places the three reference holes of the car seat frame onto the three guide tubes 8, and the frame falls naturally and is stably supported on the three stop rings 9.

[0037] Phase Two: Posture Adjustment

[0038] 1. The operator selects a preset welding program on the HMI (such as "backrest tilt angle 20°"). After the intelligent control system calculates, it drives three lifting motors 6 to move the three mounting plates 3 and the entire positioning unit and frame above them to the preset height to form the required tilt posture.

[0039] Phase 3: Intelligent Flexible Clamping

[0040] 1. After the posture is adjusted to the correct position, the operator issues a clamping command, the intelligent control system switches to torque control mode, and starts three clamping motors 13;

[0041] 2. The clamping motor 13 drives the semi-threaded screw to rotate; pushing the elastic petals 15 of the petal nut to elastically deform outward and expand radially;

[0042] 3. The expanding elastic petals 15 are tightened against the inner side of the skeleton hole wall with huge pressure, and push the skeleton to squeeze towards the stop ring 9. The system monitors the current of the three pressing motors 13 in real time.

[0043] 6. When the current first reaches the preset safe clamping force threshold, the controller immediately commands the clamping motor 13 to stop and brake;

[0044] Phase 4: Welding and Resetting

[0045] 1. The welding robot performs high-quality welding on a frame fixed in an optimal posture;

[0046] 2. After welding is completed, the clamping motor 13 reverses, and the petal nut returns to its original position;

[0047] 3. The lifting motor 6 drive system returns to the initial horizontal position, and the operator removes the welded assembly.

[0048] It should be noted that the petal nut in this embodiment differs from the petal nuts commonly found on the market in terms of material selection. In this solution, the elastic petal 15 of the petal nut is made of spring sheet, and the elastic petal 15 can recover after the deceleration motor flips and the elastic petal 15 is no longer subjected to axial compression force.

[0049] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0050] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A multi-angle positioning device for welding automotive seat frames, characterized in that, The device includes a horizontally positioned welding table with three triangularly arranged circular channels. Each circular channel contains a liftable mounting plate. A linear guide rail is longitudinally fixed to the inner wall of each circular channel, and the side wall of the mounting plate slides against the linear guide rail. A rack is also fixedly mounted to the side wall of the mounting plate. A lifting motor is installed on the side wall of the welding table corresponding to the position of each circular channel. The output shaft of the lifting motor is connected to a gear, which meshes with the rack. Each mounting plate is equipped with a radial expansion positioning unit. The radial expansion positioning unit includes a guide tube vertically fixed to the mounting plate, with a stop ring fixed to the upper end of the guide tube. The outer periphery of the guide tube is located above the stop ring. The system includes a fixed main engagement tooth; a semi-threaded screw is inserted into the guide tube, the semi-threaded screw consisting of a lower optical shaft and an upper threaded shaft, the lower optical shaft passing through the guide tube and the mounting plate and extending to the bottom of the mounting plate, a clamping motor being installed below the mounting plate, and the end of the lower optical shaft being connected to the output hole of the clamping motor; the upper threaded shaft is located above the guide tube, and a petal nut is fitted on the upper threaded shaft, the lower end face of the petal nut having a secondary engagement tooth that meshes with the main engagement tooth; the upper part of the petal nut has several evenly distributed slits axially formed to create multiple elastic petals; it also includes an intelligent control system, which is electrically connected to three lifting motors and three clamping motors simultaneously.

2. The multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, The intelligent control system uses a multi-axis motion controller or programmable logic controller as its core to control the position of the three lifting motors and the torque of the three clamping motors. The system monitors the operating current of each clamping motor in real time. When the current of any clamping motor reaches a preset safe clamping force threshold, the system controls the motor to stop running and brake.

3. The multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, Both the lifting motor and the pressing motor are servo motors or stepper motors with braking function.

4. The multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, A reinforcing rib is provided at the connection between the mounting plate and the guide tube.

5. A multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, The stop ring is a replaceable ring-shaped component.

6. The multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, The primary and secondary occlusal teeth are mutually matched end-face ratchet teeth.

7. A multi-angle positioning device for welding automotive seat frames according to claim 1, characterized in that, The petal nut is made of spring steel.

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