Automobile seat welding tool

Abstract

The application relates to the technical field of automobile part welding, and discloses an automobile seat welding tool, which comprises a base, the opposite ends of the base are respectively provided with a moving assembly on the top inner wall, the top of each moving assembly is provided with a mechanical arm, and the output end of each mechanical arm is provided with a main electric telescopic rod. The clamping assembly is driven to slide along the welding point direction by adjusting the electric telescopic rod, the clamping assembly is stopped at a safe distance on the side of the welding point before welding, the insulation characteristics of the high-thermal-conductivity insulating ceramic sheet are matched, the shunt influence of the water-cooling structure on the spot welding current is avoided from the source, and the welding point fusion core forming quality is guaranteed; after welding is completed and the fusion core is solidified, the clamping assembly gradually approaches the welding point, the water-cooling structure of the flexible water storage bag is matched to strengthen heat dissipation, the cooling shrinkage stress around the welding point is offset, the thin-walled tube is prevented from being concave and bent, and the double guarantee of welding quality and shape control effect is realized.

Description

Technical Field

[0001] This invention relates to the field of automotive parts welding technology, specifically to a welding fixture for automotive seats. Background Technology

[0002] As the core load-bearing structure of the seat, the car seat frame is mostly made of low-carbon steel thin-walled tubes and stamped connecting plates. Its welding strength and dimensional accuracy directly determine the assembly accuracy and riding safety of the seat. At present, the connection station of the seat frame generally adopts the resistance spot welding process. The positioning, clamping and shape control capabilities of the matching welding fixtures are the core elements to ensure product quality.

[0003] The existing automotive seat welding fixtures have the following problems: Existing spot welding fixtures with cooling functions often place water-cooled clamping blocks close to the weld points to suppress weld point depressions and pipe beam bending deformation in thin-walled tubes. However, the metal water-cooled clamping blocks can shunt the large current of spot welding, resulting in insufficient actual weld nugget size and reduced weld penetration, directly reducing welding strength. If the distance between the clamping block and the weld point is increased to avoid current shunt, the water-cooling shape control effect is greatly reduced, and the problem of welding deformation in thin-walled tubes still cannot be solved. It is difficult to achieve both goals at the same time. The car seat frame contains a large number of bent pipes, reducing pipes, and irregular overlapping structures, and the pipe wall contours are not standard arcs. The existing tooling water-cooling clamps are mostly rigid fixed contour-following structures, which can only be adapted to a single pipe diameter and standard straight pipe sections. For irregular contours, problems such as local suspension and excessive fitting gaps are likely to occur, resulting in large fluctuations in water-cooling heat exchange efficiency and difficulty in ensuring the consistency of welding deformation. When changing models for multiple vehicles, the entire clamping head needs to be replaced, which is costly and time-consuming. Existing tooling often uses fixed-stroke position control to determine clamping position, which cannot be adapted to the form and position tolerances of thin-walled pipe fittings. Excessive feed stroke can easily cause pipe wall crushing and indentation, while insufficient stroke can lead to problems such as clamping misalignment and poor water-cooling fit. The lack of reliable force feedback closed-loop control makes it difficult to balance clamping stability and product qualification rate. Summary of the Invention

[0004] This invention provides a welding fixture for automotive seats to solve the problems mentioned in the background art.

[0005] The present invention provides the following technical solution: a welding fixture for automobile seats, including a base, with a movable component provided on the inner wall of the top of each opposite end of the base, a robotic arm provided on the top of each movable component, a main electric telescopic rod installed at the output end of each robotic arm, a liquid cooling component installed at the output end of the main electric telescopic rod, a fixed frame installed on the side of the liquid cooling component, a welding component provided on the inner wall of the fixed frame, and a main rotating frame installed on the side of the fixed frame, with adjustment components provided on the inner walls of both sides of the main rotating frame, and a clamping component connected to the output end of each of the two adjustment components; The clamping assembly includes an arc-shaped clamping plate, a flexible water storage bag is installed on the inner wall of the arc-shaped clamping plate, a flexible skeleton is sleeved in the inner cavity of the flexible water storage bag, and a high thermal conductivity insulating ceramic sheet is arrayed on the outer surface of the flexible water storage bag away from the arc-shaped clamping plate.

[0006] As a preferred technical solution of the present invention: the adjustment component includes an adjustment motor, the output shaft of the adjustment motor is connected to a sliding frame via a coupling, an adjustment electric telescopic rod is installed on the side of the inner wall of the sliding frame, and a sliding plate is installed at the output end of the adjustment electric telescopic rod.

[0007] As a preferred embodiment of the present invention: an adjusting motor 2 is installed on the side of the sliding plate, the output shaft of the adjusting motor 2 is connected to an adjusting electric telescopic rod 2 via a coupling, and a cylinder is installed at the output end of the adjusting electric telescopic rod 2. A thin film pressure sensor is installed on the side of the inner wall of the cylinder, and a connecting rod is slidably sleeved on the inner wall of the cylinder, with both ends of the connecting rod tightly attached to the side of the inner wall of the cylinder and the side of the thin film pressure sensor, respectively.

[0008] As a preferred embodiment of the present invention: the liquid cooling assembly includes a water storage frame, a water temperature sensor is installed at the bottom of the inner wall of the water storage frame, and a semiconductor cooling chip is installed on the inner wall of the top of the water storage frame. The semiconductor cooling chip is electrically connected to the water temperature sensor. Auxiliary frames are installed on both sides of the inner wall of the water storage frame, and a small water pump is installed on the side of the auxiliary frame. The inlet of the small water pump is connected to the inner cavity of the water storage frame, and the outlet of the small water pump is connected to the inner cavity of the auxiliary frame.

[0009] As a preferred technical solution of the present invention: an inlet pipe is sleeved on the inner wall of the side of the water storage frame, and the inlet of the inlet pipe passes through the inner wall of the water storage frame and is connected to the inner cavity of the auxiliary frame. An outlet pipe is sleeved on the inner wall of the bottom of the water storage frame, and the ends of the outlet pipe and the inlet pipe away from the water storage frame are both connected to the inner cavity of the flexible water storage bag.

[0010] As a preferred embodiment of the present invention: the welding assembly includes a welding rotary motor, the side of which is connected to the inner wall of the fixed frame, the output shaft of which passes through the inner wall of the main rotating frame and is connected to a welding electric telescopic rod, and a C-type welding clamp is installed at the output end of the welding electric telescopic rod.

[0011] As a preferred embodiment of the present invention: the clamping assembly further includes a side rotating frame, the side of the side rotating frame being connected to the side of the connecting rod, an L-shaped plate being mounted on the side of the side rotating frame, a clamping motor being mounted on the side of the L-shaped plate, and a drive gear being connected to the output shaft of the clamping motor.

[0012] As a preferred technical solution of the present invention: a clamping assembly includes two arc-shaped clamps, which are arranged facing each other on the inner wall of the side rotating frame. The side of one of the arc-shaped clamps is connected to the side of the drive gear, and a transmission gear is installed on the side of the arc-shaped clamp away from the drive gear. The convex teeth of the transmission gear mesh with the convex teeth of the drive gear.

[0013] As a preferred technical solution of the present invention: the moving component includes a moving motor, the side of the moving motor is connected to the side of the base, the output shaft of the moving motor is connected to a threaded rod through a coupling, and a slider is threadedly connected to the outer edge of the threaded rod. The top of the slider is connected to the bottom of the robotic arm, and telescopic dust covers are installed on both sides of the slider, and the end of the telescopic dust cover away from the slider is connected to the side of the inner wall of the base.

[0014] As a preferred embodiment of the present invention: a clamping electric push rod is installed on the side of the inner wall of the base, and a clamping frame is installed on the side of the clamping electric push rod, and a clamping pad is installed on the inner wall of the clamping frame.

[0015] The present invention has the following beneficial effects: 1. This automotive seat welding fixture adjusts the clamping assembly along the weld point direction by adjusting the electric telescopic rod. Before welding, the clamping assembly is positioned at a safe distance to the side of the weld point. Combined with the insulation properties of the high thermal conductivity insulating ceramic sheet, the shunting effect of the water-cooling structure on the spot welding current is avoided from the source, ensuring the quality of the weld nugget formation. After welding is completed and the nugget solidifies, the clamping assembly gradually moves closer to the weld point. Combined with the water-cooling structure of the flexible water storage bag, heat dissipation is enhanced, offsetting the cooling contraction stress around the weld point, suppressing the dent and bending deformation of the thin-walled tube, and achieving dual assurance of welding quality and shape control.

[0016] 2. This automotive seat welding fixture, by employing dual-sided independent adjustment components and forming a force control closed loop with a thin-film pressure sensor inside the cylinder, can independently adjust the feed amount of the clamping components on both sides according to the actual contour of the pipe wall, automatically adapting to non-standard contours such as bent pipes and irregularly shaped pipes; at the same time, with the flexible water storage bag and arrayed high thermal conductivity insulating ceramic sheets, it can achieve adaptive fitting of micro-morphology, forming a two-level adaptive system of "macro-contour adaptation + micro-morphology fitting", which greatly improves the water-cooled surface fitting rate, stabilizes heat exchange efficiency, and provides strong consistency in welding deformation control.

[0017] 3. This automotive seat welding fixture uses a thin-film pressure sensor to collect axial bonding pressure in real time. Based on this, it uses closed-loop control to adjust the feed action of the electric telescopic rod, which can accurately control the clamping and bonding pressure. This ensures that the water-cooled surface is in full contact with the pipe wall, while avoiding crushing and denting of thin-walled pipes caused by excessive feed. It effectively eliminates clamping errors caused by the form and position tolerances of the pipe fittings and greatly improves the product qualification rate. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the fixing frame structure of the present invention; Figure 3 This is a partial cross-sectional view of the welding assembly of the present invention; Figure 4 This is a schematic diagram of the front section structure of the liquid cooling component of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the adjustment component of the present invention; Figure 6 This is a schematic diagram of the adjustment component structure of the present invention; Figure 7 This is a schematic diagram of the water inlet pipe structure of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle; Figure 9 This is a schematic diagram of the front section structure of the arc-shaped clamping plate of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point B; Figure 11 This is a schematic diagram of the front section structure of the telescopic dust cover of the present invention.

[0019] In the diagram: 1. Base; 2. Moving component; 3. Robotic arm; 4. Main electric telescopic rod; 5. Liquid cooling component; 6. Fixing frame; 7. Welding component; 8. Adjustment component; 9. Clamping component; 10. Main rotating frame; 11. Clamping electric push rod; 12. Clamping frame; 13. Clamping pad; 201. Mobile motor; 202. Threaded rod; 203. Slider; 204. Telescopic dust cover; 501. Water storage frame; 502. Water temperature sensor; 503. Semiconductor cooling chip; 504. Auxiliary frame; 505. Small water pump; 506. Inlet pipe; 507. Outlet pipe; 701. Welding rotary motor; 702. Welding electric telescopic rod; 703. C-type welding clamp; 801. Adjusting motor one; 802. Sliding frame; 803. Adjusting electric telescopic rod one; 804. Sliding plate; 805. Adjusting motor two; 806. Adjusting electric telescopic rod two; 807. Cylinder; 808. Thin-film pressure sensor; 809. Connecting rod; 901. Side-rotating frame; 902. L-shaped plate; 903. Clamping motor; 904. Drive gear; 905. Arc-shaped clamping plate; 906. Transmission gear; 907. Flexible water storage bag; 908. Flexible frame; 909. High thermal conductivity insulating ceramic sheet. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1 - Figure 11 A welding fixture for automotive seats includes a base 1. A movable component 2 is provided on the inner wall of the top of each opposite end of the base 1. A robotic arm 3 is provided on the top of each movable component 2. A main electric telescopic rod 4 is installed at the output end of each robotic arm 3. A liquid cooling component 5 is installed at the output end of the main electric telescopic rod 4. A fixing frame 6 is installed on the side of the liquid cooling component 5. A welding component 7 is provided on the inner wall of the fixing frame 6. A main rotating frame 10 is installed on the side of the fixing frame 6. Adjustment components 8 are provided on the inner walls of both sides of the main rotating frame 10. A clamping component 9 is connected to the output end of each of the two adjustment components 8. In the above structure, the base 1 serves as the supporting mounting base for the entire machine, and the moving component 2 is used to drive the robotic arm 3 to translate along the length of the workpiece, realizing continuous switching of multiple welding points; the robotic arm 3, together with the main electric telescopic rod 4, can realize the spatial posture and feed depth adjustment of the welding execution end, adapting to the irregular welding points of different angles and depths of the seat frame; the fixed frame 6 and the main rotating frame 10 constitute the integrated mounting base of the execution end, and the symmetrically arranged adjustment component 8 and clamping component 9 can independently clamp and position the base material on both sides of the welding point, ensuring the stability of the workpiece constraint during the welding process, and providing an installation carrier for the follow-up water-cooled shape control structure; It should be noted that the automotive seat welding fixture of the present invention also includes a control system. Electrical actuators and sensing components such as the adjusting motor 801, the adjusting electric telescopic rod 803, the thin film pressure sensor 808, the water temperature sensor 502, and the semiconductor cooling chip 503 are all electrically connected to the control system. The control system receives sensor signals and issues action commands to realize the automated and coordinated operation of the fixture.

[0022] The clamping assembly 9 includes an arc-shaped clamping plate 905, a flexible water storage bag 907 installed on the inner wall of the arc-shaped clamping plate 905, a flexible skeleton 908 sleeved in the inner cavity of the flexible water storage bag 907, and a high thermal conductivity insulating ceramic sheet 909 arrayed on the outer surface of the flexible water storage bag 907 away from the arc-shaped clamping plate 905. In the above structure, the arc-shaped clamping plate 905 serves as the rigid support base of the clamping component 9, providing rigid back support for the flexible water storage bag 907 and limiting the bag's outward expansion. The flexible water storage bag 907 can adaptively deform according to the pipe wall contour, ensuring that the heat exchange surface and the workpiece surface are fully in contact, eliminating the contact gap of the rigid clamping. The flexible skeleton 908 is used to maintain the basic cavity shape of the water storage bag, avoiding excessive collapse or bulging of the bag due to water pressure fluctuations, and ensuring smooth flow of cooling water. The arrayed high thermal conductivity insulating ceramic sheets 909 have both high thermal conductivity and electrical insulation properties, which can quickly conduct the heat of the workpiece to the cooling water to achieve cooling, and can also completely block the parallel shunt current flow path of the spot welding current, avoiding interference of the water cooling structure with the weld nugget formation quality.

[0023] In a preferred embodiment: the adjustment assembly 8 includes an adjustment motor 801, the output shaft of the adjustment motor 801 is connected to a sliding frame 802 via a coupling, an adjustment electric telescopic rod 803 is installed on the side of the inner wall of the sliding frame 802, and a sliding plate 804 is installed at the output end of the adjustment electric telescopic rod 803. In the above structure, the adjusting motor 801 is used to drive the sliding frame 802 to rotate around the axis, adjust the circumferential deflection angle of the clamping assembly 9, and adapt to the clamping requirements of pipe walls with different inclination angles; the sliding frame 802 serves as the mounting base of the linear adjustment mechanism, providing precise guiding support for the adjusting electric telescopic rod 803 and the sliding plate 804; the adjusting electric telescopic rod 803 can drive the sliding plate 804 to make linear reciprocating motion along the normal of the weld point, thereby driving the clamping assembly 9 to dynamically adjust the distance between itself and the weld point, realizing the time-sequential shape control logic of "far-position avoidance and diversion during the welding stage and near-position strong cooling after welding".

[0024] In a preferred embodiment: an adjusting motor 805 is mounted on the side of the sliding plate 804, the output shaft of the adjusting motor 805 is connected to an adjusting electric telescopic rod 806 via a coupling, and a cylinder 807 is mounted on the output end of the adjusting electric telescopic rod 806. A thin film pressure sensor 808 is mounted on the side of the inner wall of the cylinder 807, and a connecting rod 809 is slidably sleeved on the inner wall of the cylinder 807, with both ends of the connecting rod 809 in close contact with the side of the inner wall of the cylinder 807 and the side of the thin film pressure sensor 808, respectively. In the above structure, the second adjusting motor 805 is used to drive the second adjusting electric telescopic rod 806 to rotate as a whole, further fine-tuning the deflection angle of the clamping assembly 9 and improving the contour adaptation capability of the bent pipe and irregular overlapping structure; the second adjusting electric telescopic rod 806 is used to drive the cylinder 807 and the connecting rod 809 to make axial feed, pushing the clamping assembly 9 closer to or away from the workpiece tube wall; the thin film pressure sensor 808 is arranged for axial force, and after the connecting rod 809 is subjected to the reaction force of the workpiece, it can directly transmit the pressure to the sensitive surface of the thin film pressure sensor 808, and collect the axial pressure value of the clamping fit in real time, thereby forming a force control closed loop, accurately controlling the feed stroke, ensuring that the water-cooled surface is fully fitted with the tube wall, and avoiding excessive feed that crushes the thin-walled tube wall.

[0025] In a preferred embodiment: the liquid cooling assembly 5 includes a water storage frame 501, a water temperature sensor 502 is installed at the bottom of the inner wall of the water storage frame 501, and a semiconductor cooling chip 503 is installed on the inner wall of the top of the water storage frame 501. The semiconductor cooling chip 503 is electrically connected to the water temperature sensor 502. Auxiliary frames 504 are installed on both sides of the inner wall of the water storage frame 501. A small water pump 505 is installed on the side of the auxiliary frame 504. The inlet of the small water pump 505 is connected to the inner cavity of the water storage frame 501, and the outlet of the small water pump 505 is connected to the inner cavity of the auxiliary frame 504. In the above structure, the water storage frame 501 serves as the main water storage chamber for cooling water, providing a stable water source for the circulating cooling system. The water temperature sensor 502 collects the cooling water temperature in the water storage frame 501 in real time. When the water temperature exceeds the set threshold, the semiconductor refrigeration chip 503 automatically starts cooling to stabilize the water temperature within the set operating range, ensuring continuous and stable heat exchange efficiency. The auxiliary frame 504 is used to integrate and install a small water pump 505, allowing the cooling water to enter the circulation pipeline after being pressurized by the water pump from the water storage frame 501, providing stable power for the water cooling circulation. The use of semiconductor refrigeration eliminates the need for additional refrigerant pipelines, resulting in a compact structure and small size, which is suitable for the integrated layout requirements of the follow-up actuator.

[0026] In a preferred embodiment: an inlet pipe 506 is sleeved on the inner wall of the side of the water storage frame 501, and the inlet of the inlet pipe 506 passes through the inner wall of the water storage frame 501 and is connected to the inner cavity of the auxiliary frame 504. An outlet pipe 507 is sleeved on the inner wall of the bottom of the water storage frame 501, and the ends of the outlet pipe 507 and the inlet pipe 506 away from the water storage frame 501 are both connected to the inner cavity of the flexible water storage bag 907. In the above structure, the inlet pipe 506 and the outlet pipe 507 constitute the supply loop and return loop of the cooling water circulation, respectively. The pressurized low-temperature cooling water is transported to the flexible water storage bag 907 through the inlet pipe 506. After heat exchange with the workpiece, the heated cooling water flows back to the water storage frame 501 through the outlet pipe 507 for cooling and temperature reduction, forming a complete closed loop. Both the inlet pipe 506 and the outlet pipe 507 are made of flexible heat-resistant pipes, which can be bent synchronously with the angle adjustment and position movement of the clamping component 9 without interfering with the normal movement of the mechanism.

[0027] In a preferred embodiment: the welding assembly 7 includes a welding rotary motor 701, the side of which is connected to the inner wall of the fixing frame 6, the output shaft of the welding rotary motor 701 passes through the inner wall of the main rotating frame 10 and is connected to a welding electric telescopic rod 702, and a C-type welding clamp 703 is installed at the output end of the welding electric telescopic rod 702. In the above structure, the welding rotary motor 701 is used to drive the welding electric telescopic rod 702 and the C-type welding clamp 703 to rotate around the axis, adjust the spot welding operation angle, and adapt to the welding requirements of irregularly shaped weld points in space; the welding electric telescopic rod 702 is used to drive the C-type welding clamp 703 to perform feed motion, so that the welding clamp electrode is accurately aligned with the weld point position and completes electrode pressure; the C-type welding clamp 703 is the main body of resistance spot welding, which applies pressure to the workpiece through the upper and lower electrodes and passes a large current, and uses the contact resistance to generate heat to realize the workpiece fusion, which is the mainstream process equipment for welding thin-walled tubes of automotive seat frames.

[0028] In a preferred embodiment: the clamping assembly 9 further includes a side rotating frame 901, the side of the side rotating frame 901 is connected to the side of the connecting rod 809, an L-shaped plate 902 is mounted on the side of the side rotating frame 901, a clamping motor 903 is mounted on the side of the L-shaped plate 902, and the output shaft of the clamping motor 903 is connected to a drive gear 904. In the above structure, the side rotating frame 901 serves as the mounting base for the clamping assembly 9. After being fixedly connected to the connecting rod 809, it can synchronously complete the position movement and angle adjustment with the adjusting assembly 8. The L-shaped plate 902 provides mounting support for the clamping motor 903 and the gear transmission mechanism, making the transmission structure layout compact and reducing the overall volume of the clamping assembly 9. The output power of the clamping motor 903 is transmitted through the drive gear 904 to provide driving force for the opening and closing action of the arc-shaped clamping plate 905, realizing the radial clamping and loosening action of the pipe wall.

[0029] In a preferred embodiment: a clamping assembly 9 includes two arc-shaped clamping plates 905, which are disposed facing each other on the inner wall of the side rotating frame 901. The side of one arc-shaped clamping plate 905 is connected to the side of the drive gear 904, and a transmission gear 906 is mounted on the side of the arc-shaped clamping plate 905 away from the drive gear 904. The convex teeth of the transmission gear 906 mesh with the convex teeth of the drive gear 904. In the above structure, the drive gear 904 and the transmission gear 906 mesh with each other and drive the two arc-shaped clamping plates 905 to rotate synchronously in opposite directions or in opposite directions, so as to realize the synchronous opening and closing of the clamping and ensure that the clamping force on both sides is uniform and symmetrical. The two arc-shaped clamping plates 905 arranged in opposite directions can wrap around the workpiece tube wall in the radial direction to form a stable radial constraint, prevent the workpiece from moving or deflecting during the welding process, and at the same time provide a stable clamping foundation for the flexible water-cooling structure.

[0030] In a preferred embodiment: the moving component 2 includes a moving motor 201, the side of the moving motor 201 is connected to the side of the base 1, the output shaft of the moving motor 201 is connected to a threaded rod 202 via a coupling, and the outer edge of the threaded rod 202 is threadedly connected to a slider 203, the top of the slider 203 is connected to the bottom of the robotic arm 3, and telescopic dust covers 204 are installed on both sides of the slider 203, and the end of the telescopic dust cover 204 away from the slider 203 is connected to the side of the inner wall of the base 1; In the above structure, the moving motor 201 drives the threaded rod 202 to rotate, and the rotational motion is converted into the linear reciprocating motion of the slider 203 through the lead screw transmission, thereby driving the robotic arm 3 to move along the length direction of the base 1 to realize the continuous switching operation of welding points at different workstations; the telescopic dust cover 204 extends and retracts synchronously with the slider 203, completely sealing the threaded rod 202 and the guide rail area, blocking welding spatter and dust from entering the transmission pair, avoiding wear and jamming of the lead screw, and improving the service life and operating accuracy of the moving mechanism.

[0031] In a preferred embodiment: a clamping electric push rod 11 is installed on the side of the inner wall of the base 1, and a clamping frame 12 is installed on the side of the clamping electric push rod 11, and a clamping pad 13 is installed on the inner wall of the clamping frame 12. In the above structure, the clamping electric push rod 11 can drive the clamping frame 12 to move in opposite directions, clamping and positioning the entire seat frame from both ends of the workpiece, and establishing a global reference for the welding operation; the clamping pad 13 is made of flexible high temperature resistant material, which can increase the clamping friction and avoid rigid clamping from damaging the zinc plating layer on the workpiece surface, thus ensuring the appearance quality and corrosion resistance of the workpiece.

[0032] Working principle: The car seat frame to be welded is placed in the working area of ​​the base 1. The clamping electric push rods 11 on both sides of the base 1 extend synchronously, pushing the clamping frame 12 to move towards each other. The clamping pads 13 hold the frame tube from both ends of the workpiece, completing the overall clamping and positioning of the workpiece, establishing a global reference for the welding operation, and preventing the workpiece from shifting as a whole during the welding process. The mobile motor 201 starts, driving the threaded rod 202 to rotate. Through the screw drive, the slider 203 moves along the length of the base 1, thereby moving the robotic arm 3 to the corresponding position of the target welding point. The telescopic dust cover 204 extends and retracts synchronously with the slider 203, protecting the threaded rod 202 and the transmission area throughout the process. Then, the robotic arm 3, in conjunction with the main electric telescopic rod 4, adjusts its spatial posture, driving the liquid cooling component 5 and the fixed frame 6 to move to the working height. The welding rotation motor 701 synchronously drives the welding electric telescopic rod 702 and the C-type welding clamp 703 to rotate, so that the electrode of the C-type welding clamp 703 is aligned with the welding point position, completing the pre-adjustment of the welding posture. Adjusting motor 1 801 drives sliding frame 802 to rotate, and adjusting motor 2 805 drives adjusting electric telescopic rod 2 806 to rotate, together adjusting the circumferential angle of clamping assembly 9 so that the opening direction of arc-shaped clamping plate 905 matches the contour of pipe wall; adjusting electric telescopic rod 1 803 drives sliding plate 804 to move backward along the normal of weld point, adjusting clamping assembly 9 to a far safe zone at a preset distance from weld point; clamping motor 903 starts, and through the meshing of drive gear 904 and transmission gear 906, drives the two arc-shaped clamping plates 905 to rotate synchronously in opposite directions, radially clamping the workpiece pipe wall, completing the initial clamping and positioning; Then, adjust the extension of the electric telescopic rod 806 to push the cylinder 807 and the connecting rod 809 axially forward, driving the side rotating frame 901 and the arc-shaped clamp 905 to press against the pipe wall; when the high thermal conductivity insulating ceramic sheet 909 contacts the pipe wall, the connecting rod 809 is subjected to a reaction force to press the thin film pressure sensor 808 backward. When the axial pressure detected by the thin film pressure sensor 808 reaches the preset bonding threshold, adjust the electric telescopic rod 806 to stop feeding and lock it, completing the adaptive bonding of the irregular pipe wall, ensuring that the water-cooled surface is in full contact with the pipe wall and will not crush the thin-walled pipe body; The small water pump 505 starts, pressurizes the cooling water in the water storage frame 501 and sends it into the auxiliary frame 504, and then delivers it to the inner cavity of the flexible water storage bag 907 through the water inlet pipe 506. The flexible frame 908 maintains the cavity shape of the water storage bag to ensure uniform water flow. After the cooling water absorbs heat from the pipe wall through the high thermal conductivity insulating ceramic sheet 909, it flows back to the water storage frame 501 through the water outlet pipe 507 to complete the circulation. The water temperature sensor 502 monitors the return water temperature in real time. When the water temperature exceeds the set threshold, the semiconductor cooling chip 503 automatically starts cooling to stabilize the cooling water temperature within the working range. After the water cooling system is running stably, the welding electric telescopic rod 702 drives the C-type welding clamp 703 to feed, the upper and lower electrodes press the workpiece together and a large current is applied to complete the resistance spot welding; during the welding process, the clamping component 9 always remains in a remote position, and with the electrical insulation characteristics of the high thermal conductivity insulating ceramic sheet 909, the welding current shunting is avoided from the source, ensuring the quality of the weld nugget formation; at this stage, the water cooling maintains a low flow rate, only removing the basic heat of the base material, without interfering with the solidification process of the weld nugget; After spot welding is completed and the weld nugget is completely solidified, the risk of flow diversion is eliminated. Adjust the electric telescopic rod 803 to drive the sliding plate 804 and the clamping assembly 9 to slowly slide towards the weld point. The thin-film pressure sensor 808 provides real-time feedback on the axial contact pressure throughout the sliding process. The system dynamically adjusts the feed speed to maintain stable contact pressure, ensuring that the high thermal conductivity insulating ceramic sheet 909 is always in close contact with the pipe wall, while avoiding excessive pressure that could scratch the workpiece coating. Simultaneously, the small water pump 505 gradually increases its output power and increases the cooling water circulation flow rate. As the clamping point approaches the weld point, the cooling intensity is gradually strengthened, accelerating the heat dissipation around the weld point, offsetting the cooling contraction stress of the pipe wall, and suppressing weld point depression and pipe beam bending deformation. After the temperature of the area to be welded drops to the set threshold, the small water pump 505 gradually reduces its power, and the water cooling flow rate decreases. The electric telescopic rod 803 is adjusted to drive the clamping assembly 9 back to its initial position, and the clamping motor 903 rotates in the opposite direction, driving the arc-shaped clamping plate 905 to release the workpiece. The welding electric telescopic rod 702 drives the C-type welding clamp 703 to retract, completing the single welding point operation. Then, the moving assembly 2 drives the robotic arm 3 to move to the next welding point station, and the above process is repeated until all welding points are completed. After all operations are completed, each mechanism is reset to its initial state, and the clamping electric push rod 11 drives the clamping frame 12 to retract, allowing the welded seat frame to be removed.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A welding fixture for automobile seats, comprising a base (1), wherein a movable component (2) is provided on the inner wall of the top of each opposite end of the base (1), and a robotic arm (3) is provided on the top of each movable component (2), and a main electric telescopic rod (4) is installed at the output end of each robotic arm (3), characterized in that: The output end of the main electric telescopic rod (4) is equipped with a liquid cooling component (5), and a fixing frame (6) is installed on the side of the liquid cooling component (5). The inner wall of the fixing frame (6) is provided with a welding component (7), and the side of the fixing frame (6) is equipped with a main rotating frame (10). The inner walls on both sides of the main rotating frame (10) are provided with adjustment components (8), and the output ends of the two adjustment components (8) are respectively connected to a clamping component (9). The clamping assembly (9) includes an arc-shaped clamp (905), on the inner wall of the arc-shaped clamp (905) a flexible water storage bag (907) is installed, the inner cavity of the flexible water storage bag (907) is fitted with a flexible skeleton (908), and a high thermal conductivity insulating ceramic sheet (909) is arrayed on the outer surface of the flexible water storage bag (907) away from the arc-shaped clamp (905).

2. The automotive seat welding fixture according to claim 1, characterized in that: The adjustment assembly (8) includes an adjustment motor (801), the output shaft of which is connected to a sliding frame (802) via a coupling, an adjustment electric telescopic rod (803) is installed on the side of the inner wall of the sliding frame (802), and a sliding plate (804) is installed at the output end of the adjustment electric telescopic rod (803).

3. The automotive seat welding fixture according to claim 2, characterized in that: An adjusting motor (805) is installed on the side of the sliding plate (804). The output shaft of the adjusting motor (805) is connected to an adjusting electric telescopic rod (806) via a coupling. A cylinder (807) is installed at the output end of the adjusting electric telescopic rod (806). A thin film pressure sensor (808) is installed on the side of the inner wall of the cylinder (807). A connecting rod (809) is slidably sleeved on the inner wall of the cylinder (807). The two ends of the connecting rod (809) are respectively in close contact with the side of the inner wall of the cylinder (807) and the side of the thin film pressure sensor (808).

4. The automotive seat welding fixture according to claim 1, characterized in that: The liquid cooling assembly (5) includes a water storage frame (501), a water temperature sensor (502) is installed at the bottom of the inner wall of the water storage frame (501), and a semiconductor cooling chip (503) is installed on the inner wall of the top of the water storage frame (501). The semiconductor cooling chip (503) is electrically connected to the water temperature sensor (502). An auxiliary frame (504) is installed on both sides of the inner wall of the water storage frame (501). A small water pump (505) is installed on the side of the auxiliary frame (504). The inlet of the small water pump (505) is connected to the inner cavity of the water storage frame (501), and the outlet of the small water pump (505) is connected to the inner cavity of the auxiliary frame (504).

5. The automotive seat welding fixture according to claim 4, characterized in that: The inner wall of the side of the water storage frame (501) is fitted with an inlet pipe (506), and the inlet of the inlet pipe (506) passes through the inner wall of the water storage frame (501) and is connected to the inner cavity of the auxiliary frame (504). The inner wall of the bottom of the water storage frame (501) is fitted with an outlet pipe (507), and the ends of the outlet pipe (507) and the inlet pipe (506) away from the water storage frame (501) are connected to the inner cavity of the flexible water storage bag (907).

6. The automotive seat welding fixture according to claim 1, characterized in that: The welding assembly (7) includes a welding rotary motor (701), the side of which is connected to the inner wall of the fixed frame (6). The output shaft of the welding rotary motor (701) passes through the inner wall of the main rotating frame (10) and is connected to a welding electric telescopic rod (702). A C-type welding clamp (703) is installed at the output end of the welding electric telescopic rod (702).

7. The automotive seat welding fixture according to claim 3, characterized in that: The clamping assembly (9) also includes a side rotating frame (901), the side of which is connected to the side of the connecting rod (809). An L-shaped plate (902) is mounted on the side of the side rotating frame (901), and a clamping motor (903) is mounted on the side of the L-shaped plate (902). The output shaft of the clamping motor (903) is connected to a drive gear (904).

8. The automotive seat welding fixture according to claim 7, characterized in that: One of the clamping components (9) includes two arc-shaped clamps (905), which are arranged facing each other on the inner wall of the side rotating frame (901). The side of one of the arc-shaped clamps (905) is connected to the side of the drive gear (904), and a transmission gear (906) is installed on the side of the arc-shaped clamp (905) away from the drive gear (904). The convex teeth of the transmission gear (906) mesh with the convex teeth of the drive gear (904).

9. The automotive seat welding fixture according to claim 1, characterized in that: The moving component (2) includes a moving motor (201), the side of which is connected to the side of the base (1). The output shaft of the moving motor (201) is connected to a threaded rod (202) via a coupling. The outer edge of the threaded rod (202) is threadedly connected to a slider (203). The top of the slider (203) is connected to the bottom of the robotic arm (3). Telescopic dust covers (204) are installed on both sides of the slider (203), and the end of the telescopic dust cover (204) away from the slider (203) is connected to the side of the inner wall of the base (1).

10. The automotive seat welding fixture according to claim 1, characterized in that: The inner wall of the base (1) is equipped with a clamping electric push rod (11), and a clamping frame (12) is installed on the side of the clamping electric push rod (11). The inner wall of the clamping frame (12) is equipped with a clamping pad (13).

Images