Lightweight interior and exterior trim ultrasonic flexible welding device

Abstract

The present application relates to ultrasonic welding device technical field, and disclose a kind of lightweight interior and exterior trim ultrasonic flexible welding device, including mechanical arm and welding platform, the end of mechanical arm is equipped with fork-shaped end support, mechanical arm end is also equipped with welding head mounting seat, welding head mounting seat is connected with the end support of mechanical arm by rotating assembly, and two ultrasonic execution units are equipped on the side away from rotating assembly, ultrasonic execution unit is staggered arrangement on the surface of welding head mounting seat, ultrasonic execution unit all includes welding head adjusting assembly and ultrasonic welding head, rotating assembly drives welding head mounting seat to rotate around preset axis, welding head adjusting assembly can adjust the interval between different ultrasonic welding head on the same welding head mounting seat, mechanical arm is arranged in the side of welding platform, mould assembly is equipped on welding platform, when different plastic parts need to be welded, after replacing mould assembly, adjust rotating angle of rotating assembly and adjust welding head interval by welding head adjusting assembly.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic welding equipment technology, specifically to a lightweight ultrasonic flexible welding device for interior and exterior trim parts. Background Technology

[0002] Plastic components in automotive interior and exterior trim (such as dashboards, door panels, bumpers, and trim strips) typically require ultrasonic welding for connection and fixation during the manufacturing process. Ultrasonic welding utilizes high-frequency mechanical vibration to generate heat and melt the contact surfaces of the plastic parts being welded through friction, achieving a connection under pressure. With the rapid pace of vehicle model updates, the shape and weld point distribution of interior and exterior trim products change frequently, requiring welding equipment to possess high flexibility to adapt to the rapid switching between different products.

[0003] In existing technologies, devices for ultrasonic welding of interior and exterior trim parts generally include a robotic arm and a welding platform. An ultrasonic welding head is mounted at the end of the robotic arm, and a mold assembly is installed on the welding platform to position and support the plastic part to be welded. During welding, the robotic arm moves the ultrasonic welding head to the welding position, where the welding head applies pressure to the plastic part and outputs ultrasonic vibrations to complete the welding. To improve welding efficiency, existing devices have multiple ultrasonic welding heads at the end of the robotic arm, and the spacing between the welding heads can be adjusted via a welding head adjustment mechanism. Furthermore, to accommodate interior and exterior trim parts of different shapes and sizes, some devices use replaceable mold assemblies, which are removed and the welding head positions are readjusted when changing products.

[0004] However, the aforementioned existing technologies have the following technical problems in practical applications: When switching between different plastic parts, the adjustment of the welding head spacing and posture usually requires repeated manual adjustments, or even disassembly and reassembly, and sometimes even replacement of the entire equipment. This results in long changeover times and makes it difficult to meet the demands of flexible production for rapid switching. Multiple ultrasonic welding heads in a limited space cannot achieve independent spatial posture and extension distance adjustments, which can easily lead to poor adhesion between the welding end face and the surface of the plastic part to be welded, affecting welding quality. The locking and positioning structure after mold assembly replacement is complex to operate, and the locking force is unevenly applied. Under the pressure of welding and ultrasonic vibration, the mold assembly is prone to displacement, affecting the consistency of the weld point position and welding stability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a lightweight ultrasonic flexible welding device for interior and exterior trim parts. It has the advantages of independent and rapid adjustment of welding head spacing and spatial posture, and reliable locking and positioning of mold components. It solves the problems of low changeover efficiency, easy displacement of mold components, and poor accuracy retention of guide structure in existing devices.

[0006] To achieve the goals of independently and quickly adjusting the welding head spacing and spatial posture, and reliably locking and positioning the mold assembly, this invention provides the following technical solution: A lightweight ultrasonic flexible welding device for interior and exterior trim parts includes a robotic arm and a welding platform. The robotic arm has a forked end bracket at its end and a welding head mounting base at its end. The welding head mounting base is connected to the end bracket of the robotic arm via a rotating assembly. Two ultrasonic actuators are located on the side facing away from the rotating assembly. The ultrasonic actuators are staggered on the surface of the welding head mounting base. Each ultrasonic actuator includes a welding head adjustment assembly and an ultrasonic welding head. The rotating assembly drives the welding head mounting base to rotate around a preset axis. The welding head adjustment assembly can adjust the spacing between different ultrasonic welding heads located on the same welding head mounting base. The ultrasonic welding heads in the ultrasonic actuators can be individually disassembled and replaced. The robotic arm is mounted on the side of the welding platform, which is equipped with a mold assembly. The mold assembly holds the plastic parts to be welded. When different plastic parts need to be welded, the mold assembly can be replaced, and the rotation angle of the rotating assembly and the welding head spacing can be adjusted by the welding head adjusting assembly.

[0007] The ultrasonic welding head is mounted on the surface of the welding head mounting base via a welding head adjustment assembly. The axes of the ultrasonic welding heads in different ultrasonic actuators do not coincide, and the ultrasonic welding heads face opposite directions. When the robotic arm moves the end bracket, each ultrasonic actuator independently adjusts the spatial orientation and extension distance of the welding end face of the ultrasonic welding head relative to the welding platform below through the corresponding rotation assembly and welding head adjustment assembly.

[0008] The welding head adjustment assembly includes a track base and a slider. The slider of the welding head adjustment assembly is connected to the ultrasonic welding head and is used to drive the ultrasonic welding head to reciprocate along its own vibration axis.

[0009] On the welding head mounting base, a zero-position contact block is provided at the tail end of the welding head adjustment assembly. When the welding head adjustment assembly drives the ultrasonic welding head to move to the end of the stroke, the zero-position contact block forms a physical contact to prevent the welding head adjustment assembly from continuing to retract.

[0010] The welding head adjustment assembly includes a linear guide assembly, which comprises a guide rod and a guide sleeve. The guide sleeve has an extended wear-resistant copper sleeve inside. The axial length of the wear-resistant copper sleeve along the guide rod is 1.5 times or more the outer diameter of the guide rod, which is used to significantly increase the contact area between the guide rod and the guide sleeve and absorb the lateral load force generated during welding pressure.

[0011] The welding platform includes a base plate, a guide structure, and a locking assembly. The base plate is fixedly installed, the guide structure is laid on the upper surface of the base plate, and the locking assembly is disposed on both sides of the upper surface of the base plate. The base plate is a plane for placing the mold assembly. The bottom of the mold assembly is provided with a guide rail that slides with the guide structure, and the sides of the mold assembly are provided with locking fittings that cooperate with the locking assembly. When the welding platform is mounted on the base plate of the welding platform, it is locked in place by the cooperation of the locking assembly and the locking fittings.

[0012] The locking assembly includes a mounting base, a pneumatic cylinder, a U-shaped clamping hinge, and a linkage clamping arm. The mounting base is fixed on the base plate of the welding platform. The pneumatic cylinder is vertically mounted on the mounting base. The piston rod of the pneumatic cylinder extends upward, and a U-shaped clamping hinge is fixed to the top of the piston rod. One end of the linkage clamping arm is hinged to the U-shaped clamping hinge and contacts the piston pushed out by the pneumatic cylinder. The other end forms a clamping head facing the locking fitting. The locking fitting is a convex-shaped limiting block. When the pneumatic cylinder drives the piston rod to rise, it causes the linkage clamping arm to swing around the central axis of the U-shaped clamp hinge, so that the clamping head of the linkage clamping arm engages with the locking engagement part, pressing and fixing the locking engagement part onto the base plate of the welding platform.

[0013] The welding head mounting base is rectangular plate-shaped, and two symmetrical saddle-shaped blocks are provided on the side of the welding head mounting base facing the rotating component. A connecting plate is provided at the output end of the rotating component, and the side of the connecting plate is connected to the inner surface of the two saddle-shaped blocks.

[0014] The robotic arm is provided with at least two robotic arms, which are set on the same side of the welding platform. Each robotic arm has a welding head mounting seat and two ultrasonic actuators.

[0015] Compared with the prior art, the present invention provides a lightweight ultrasonic flexible welding device for interior and exterior trim parts, which has the following advantages: 1. This lightweight ultrasonic flexible welding device for interior and exterior trim parts uses a fork-shaped bracket at the end of a robotic arm to bring the rotating component and welding head mounting base close to the center of the flange at the end of the robotic arm. The rotating component drives the welding head mounting base to rotate around a preset axis, and the welding head adjustment component adjusts the distance between two staggered ultrasonic welding heads. This allows for replacement of different plastic parts without disassembling the welding head mounting base and ultrasonic welding heads; only the rotation angle of the rotating component and the welding head spacing need to be adjusted to match the welding points on the new mold assembly. This effectively shortens changeover time and improves the flexible adaptability of the welding device to different interior and exterior trim products. Simultaneously, the staggered arrangement of the two ultrasonic actuators and the opposite orientation of the ultrasonic welding heads enable simultaneous welding at different positions on the welding platform, avoiding structural collisions and vibration interference between the welding heads, thereby improving welding efficiency. Compared to traditional welding devices, this application's structure only requires disassembly and replacement of the mold assembly and adjustment of the welding heads; the overall structure does not need to be disassembled. One system can weld multiple products, offering rapid changeover, strong adaptability, and achieving the goal of flexible welding.

[0016] 2. This lightweight ultrasonic flexible welding device for interior and exterior trim parts drives the ultrasonic welding head to reciprocate along its own vibration axis through a welding head adjustment assembly. A zero-position contact block is set at the tail end of the welding head adjustment assembly to physically abut and limit the end point of the retraction stroke. Combined with the structural design of the extended wear-resistant copper sleeve inside the guide sleeve in the linear guide assembly, with an axial length of not less than 1.5 times the outer diameter of the guide rod, the contact area between the guide rod and the guide sleeve is increased. This disperses the lateral load generated during welding pressure to a longer bearing area, avoiding local contact stress concentration. This maintains the fitting accuracy and movement stability between the ultrasonic welding head end face and the surface of the plastic part to be welded, reduces wear on the guide pair, and solves the problems of decreased guide structure accuracy and poor welding head end face fitting caused by lateral load. At the same time, the welding head mounting base is rigidly connected to the side of the output end connecting plate of the rotating assembly through two saddle-shaped blocks, enhancing the stability of the rotational motion transmission and ensuring that the welding head mounting base maintains reliable positioning with the end of the robotic arm during angle adjustment.

[0017] 3. This lightweight ultrasonic flexible welding device for interior and exterior trim components utilizes a guide structure laid on the welding platform base plate. A guide rail, slidingly engaging with the guide structure, is installed at the bottom of the mold assembly, allowing the mold assembly to be smoothly pushed into the welding position along a predetermined path. Simultaneously, U-shaped locking fittings are installed on both sides of the mold assembly. When the pneumatic cylinder piston rod rises, it drives the linkage clamping arm to swing around the central axis of the U-shaped hinge, causing the clamping head to press against the top wide flange of the locking fitting, thus firmly fixing the mold assembly to the welding platform base plate. This locking structure uses a pneumatic cylinder to drive the hinge to swing, achieving the clamping head's pressure against the U-shaped limiting block. The locking force is directed towards the base plate, preventing the mold assembly from shifting position under welding pressure and ultrasonic vibration, ensuring the consistency of the weld point position and welding stability. This solves the problems of unreliable locking and positioning and easy shifting of existing mold assembly locking systems. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the staggered arrangement structure of the ultrasonic welding head of the present invention; Figure 2 This is a schematic diagram of the saddle-shaped stop block structure of the present invention; Figure 3 This is a schematic diagram of the structure of the tire mold assembly of the present invention; Figure 4 For the present invention Figure 1 Detailed structural diagram at point A; Figure 5 For the present invention Figure 2 Schematic diagram showing structural details at point B.

[0019] In the diagram: 1. Robotic arm; 11. End effector; 12. Welding head mounting base; 13. Ultrasonic welding head; 111. Rotating assembly; 121. Saddle-shaped stop; 131. Welding head adjustment assembly; 132. Zero-position contact block; 1311. Linear guide assembly; 2. Welding platform; 21. Mold assembly; 22. Locking assembly; 211. Locking mating parts. 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 Figures 1-3This lightweight ultrasonic flexible welding device for interior and exterior trim parts includes a robotic arm 1 and a welding platform 2. The welding platform 2 is used to fix and place the mold assembly 21. The robotic arm 1 is used to drive the end bracket 11 to move within the working range above the welding platform 2, so that the ultrasonic actuator mounted on the end bracket 11 can perform ultrasonic welding on the plastic parts to be welded on the mold assembly 21. The end of the robotic arm 1 is provided with a fork-shaped end bracket 11. The fork-shaped end bracket 11 is an integrally formed fork-shaped structural component. The end bracket 11 has opposing fork arms, and the opposing fork arms form an accommodating space for mounting the rotating assembly 111. The end of the end bracket 11 near the body of the robotic arm 1 is coaxially fixed to the end flange of the robotic arm 1 by bolts. The fork-shaped structure makes the mounting center of gravity of the rotating assembly 111 and the welding head mounting seat 12 close to the center of the end flange of the robotic arm 1, reducing the off-center load torque acting on the end of the robotic arm 1 during welding. The robotic arm 1 also has a welding head mounting base 12 at its end. The welding head mounting base 12 serves as a common mounting carrier for two ultrasonic actuators and is located on the side of the end bracket 11 away from the robotic arm 1 body. The welding head mounting base 12 is connected to the end bracket 11 of the robotic arm 1 via a rotating assembly 111. One end of the rotating assembly 111 is mounted between the forks of the end bracket 11, and the output end of the rotating assembly 111 is fixedly connected to the welding head mounting base 12. The rotating assembly 111 contains a servo motor and a reduction mechanism, which drive the welding head mounting base 12 to rotate around a preset axis. The rotating assembly 111 is used to change the angular position of the welding head mounting base 12 relative to the end bracket 11 of the robotic arm 1. Two ultrasonic actuators are mounted on the side facing away from the rotating assembly 111. The side of the welding head mounting base 12 facing away from the rotating assembly 111 is a planar working mounting surface. The two ultrasonic actuators are fixedly mounted on this planar working mounting surface, with a minimum distance maintained between the two ultrasonic actuators to prevent interference during welding. See also... Figure 4The ultrasonic actuators are staggered on the surface of the welding head mounting base 12. This staggered arrangement means that the projections of the axes of the ultrasonic welding heads 13 in the two ultrasonic actuators onto the working mounting surface of the welding head mounting base 12 are not collinear. The two ultrasonic actuators are staggered along the length and width directions of the welding head mounting base 12, allowing them to simultaneously correspond to different welding positions on the mold assembly 21 and preventing structural collisions during welding. Each ultrasonic actuator includes a welding head adjustment assembly 131 and an ultrasonic welding head 13. The welding head adjustment assembly 131 is directly fixed to the planar working mounting surface of the welding head mounting base 12, and the ultrasonic welding head 13 is mounted on the movable part of the welding head adjustment assembly 131. The ultrasonic welding head 13 moves as a whole along a set direction with the movable part of the welding head adjustment assembly 131. The rotating component 111 drives the welding head mounting base 12 to rotate around a preset axis, which is the central axis of the output end of the rotating component 111. The rotating component 111 drives the welding head mounting base 12 and the two ultrasonic actuators on it to rotate as a whole, so that the welding end faces of the two ultrasonic welding heads 13 can switch between different angular positions. The welding head adjusting component 131 can adjust the spacing between different ultrasonic welding heads 13 located on the same welding head mounting base 12. When the welding head adjusting component 131 is activated, it drives the corresponding ultrasonic welding head 13 to translate along the planar working mounting surface of the welding head mounting base 12, changing the relative distance between the two ultrasonic welding heads 13 to adapt to the welding point spacing of the plastic parts to be welded on different mold components 21, and to meet the flexible welding requirements of different plastic parts.

[0022] The ultrasonic welding head 13 in the ultrasonic actuator can be disassembled and replaced individually. Depending on the welding point requirements of the mold assembly 21, one of the ultrasonic welding heads 13 can be replaced with a round head or a square head, or welding heads of different lengths can be replaced.

[0023] The robotic arm 1 is mounted on the side of the welding platform 2, and its base is fixed to a mounting frame on the side of the welding platform 2. This ensures that the working range of the robotic arm 1 covers the welding area above the welding platform 2, while preventing movement interference between the mold assembly 21 and the robotic arm 1 when the mold assembly 21 is replaced above the welding platform 2. The welding platform 2 is equipped with a mold assembly 21, which is detachably mounted on the upper surface of the base plate of the welding platform 2. The upper part of the mold assembly 21 has a positioning structure for positioning and supporting the plastic part to be welded. The positioning structure supports and positions the plastic part to be welded. The mold assembly 21 holds the plastic part to be welded, which is placed within the positioning structure of the mold assembly 21. The mold assembly 21 ensures that the welding position of the plastic part to be welded is accurate and does not shift during the welding process. When different plastic parts need to be welded, after replacing the mold assembly 21, the rotation angle of the rotating assembly 111 and the welding head spacing can be adjusted by the welding head adjustment assembly 131. After replacing the mold assembly 21, there is no need to disassemble the welding head mounting base 12 and the ultrasonic welding head 13. Simply adjust the rotation angle of the rotating assembly 111 to change the orientation of the ultrasonic welding head 13, and adjust the spacing between the two ultrasonic welding heads 13 by the welding head adjustment assembly 131, so that the ultrasonic welding head 13 can be aligned with the welding point on the new mold assembly 21, thus achieving rapid changeover.

[0024] The ultrasonic welding head 13 is mounted on the surface of the welding head mounting base 12 via the welding head adjustment assembly 131. The fixed end of the ultrasonic welding head 13 is fixedly connected to the slider of the welding head adjustment assembly 131. The welding end face of the ultrasonic welding head 13 extends to the side of the welding head adjustment assembly 131 away from the welding head mounting base 12, facilitating the welding end face of the ultrasonic welding head 13 to approach and press against the plastic part to be welded. The axes of the ultrasonic welding heads 13 in different ultrasonic actuators are not coincident. The axes of the two ultrasonic welding heads 13 are parallel to each other or at a set angle in three-dimensional space, but the two axes are not collinear in space, avoiding the overlap of the vibration transmission paths of the two ultrasonic welding heads 13 and thus preventing mutual interference. Furthermore, the ultrasonic welding heads 13 face opposite directions, with the welding end faces of the two ultrasonic welding heads 13 facing different sides of the welding head mounting base 12. One ultrasonic welding head 13 has its welding end face facing one side of the welding head mounting base 12, while the other ultrasonic welding head 13 has its welding end face facing the opposite side of the welding head mounting base 12. This allows the two ultrasonic welding heads 13 to approach the plastic part to be welded on the welding platform 2 from different sides and to be adapted to the welding areas that are set opposite to each other on the plastic part to be welded. When the robotic arm 1 moves the end bracket 11, each ultrasonic actuator independently adjusts the spatial posture and extension distance of the welding end face of the ultrasonic welding head 13 relative to the welding platform 2 below through the corresponding rotating component 111 and welding head adjustment component 131. The robotic arm 1 is responsible for providing a large-range spatial positioning. The rotating component 111 adjusts the angle posture of the welding head mounting base 12 based on the positioning of the robotic arm 1. The welding head adjustment component 131 controls the extension and retraction displacement of the ultrasonic welding head 13 along its own vibration axis under this angle posture. The three work together to ensure that the welding end face of each ultrasonic welding head 13 is in contact with and presses against the welding part of the plastic part to be welded with accurate contact angle and contact pressure. The posture and extension distance adjustment processes of the two ultrasonic actuators are independent of each other and do not involve each other.

[0025] The welding head adjustment assembly 131 includes a track base and a slider. The slider of the welding head adjustment assembly 131 is connected to the ultrasonic welding head 13 and is used to drive the ultrasonic welding head 13 to reciprocate along its own vibration axis. The track base is fixed on the planar working mounting surface of the welding head mounting base 12. The upper surface of the track base is provided with a guide rail extending along the vibration axis of the ultrasonic welding head 13. The slider is slidably mounted on the guide rail. The slider is provided with mounting holes for fixing the ultrasonic welding head 13. The driving component of the welding head adjustment assembly 131 is installed at one end of the track base. The telescopic output end of the driving component is connected to the slider. When the driving component is activated, it pushes the slider to slide along the guide rail. The slider drives the ultrasonic welding head 13 to reciprocate along its own vibration axis, so that the ultrasonic welding head 13 extends forward during the welding preparation stage and retracts backward after welding is completed.

[0026] On the welding head mounting base 12, a zero-position contact block 132 is provided at the tail end of the welding head adjustment assembly 131. The zero-position contact block 132 is fixed to the planar working mounting surface of the welding head mounting base 12 by bolts or positioning pins. The zero-position contact block 132 is located at the end of the welding head adjustment assembly 131 away from the welding end face of the ultrasonic welding head 13. The zero-position contact block 132 has a contact plane on the side facing the slider or corresponding moving part of the welding head adjustment assembly 131. When the welding head adjustment assembly 131 drives the ultrasonic welding head 13 to move to the end of its stroke, the zero-position contact block 132 forms a physical contact to prevent the welding head adjustment assembly 131 from continuing to retract. The end of the stroke is the position where the ultrasonic welding head 13 retracts to the farthest point away from the plastic part to be welded. At this time, the slider or corresponding moving part of the welding head adjustment assembly 131 abuts against the contact plane of the zero-position contact block 132. The zero-position contact block 132 restricts the welding head adjustment assembly 131 to a safe retraction position, preventing the welding head adjustment assembly 131 from hitting the welding head mounting base 12 or causing damage to the guide structure after it continues to retract.

[0027] The welding head adjustment assembly 131 includes a linear guide assembly 1311, which comprises a guide rod and a guide sleeve. The guide sleeve contains an extended wear-resistant copper sleeve, the axial length of which is 1.5 times or more the outer diameter of the guide rod. This significantly increases the contact area between the guide rod and the guide sleeve, absorbing the lateral load generated during welding pressure. The linear guide assembly 1311 is installed between the rail base and the slider of the welding head adjustment assembly 131. The guide rod is fixed to the rail base or slider along its length, and the guide sleeve is correspondingly fixed to the slider or rail base. The guide rod and guide sleeve slide coaxially. In conjunction with this, an extended wear-resistant copper sleeve is press-fitted into the inner hole of the guide sleeve. The inner cylindrical surface of the wear-resistant copper sleeve and the outer cylindrical surface of the guide rod form a sliding friction pair. The length of the wear-resistant copper sleeve along the axial direction of the guide rod is set to 1.5 times or more the outer diameter of the guide rod, thereby increasing the contact area between the guide rod and the wear-resistant copper sleeve. When the ultrasonic welding head 13 presses down on the plastic part to be welded and is subjected to a lateral load, the lateral load is distributed to a longer bearing area of ​​the guide rod through the extended wear-resistant copper sleeve, avoiding excessive local contact stress, improving the guiding stability and wear life of the linear guide assembly 1311, and ensuring the fitting accuracy between the welding end face of the ultrasonic welding head 13 and the surface of the plastic part to be welded.

[0028] The welding platform 2 includes a base plate, a guide structure, and a locking assembly 22. The base plate is the basic support component of the welding platform 2. The guide structure guides the mold assembly 21 to be pushed into the welding platform 2 along a set path. The locking assembly 22 presses and fixes the mold assembly 21 onto the base plate after it has been pushed in. The base plate is fixedly installed on the surface of the equipment mounting base by anchor bolts or fixing blocks. The upper surface of the base plate is machined into a horizontal reference surface, providing a stable installation reference for the welding platform 2. The guide structure is laid on the upper surface of the base plate and consists of two parallel linear guide rails (a common structure, not shown). The two linear guide rails are fixed to the upper surface of the base plate by screws and positioning pins. The two linear guide rails extend along the pushing direction of the mold assembly 21, and the distance between the two linear guide rails corresponds to the distance between the bottom guide rails of the mold assembly 21. The locking assembly 22 is located on both sides of the upper surface of the base plate, and is arranged on the outer side of the two guide structures. The position of the locking assembly 22 corresponds to the position of the locking mating part 211 after the mold assembly 21 is pushed in and positioned. The base plate is a flat surface for placing the mold assembly 21. After the mold assembly 21 is pushed in, its bottom surface contacts the upper surface of the base plate. The upper surface of the base plate bears the weight of the mold assembly 21 and the plastic part to be welded, as well as the welding pressure generated during welding. The bottom of the mold assembly 21 is provided with a guide rail that slides with the guide structure. Two guide rails corresponding to the guide structure are provided on both sides of the bottom of the mold assembly 21. The cross-sectional shape of the guide rails is complementary to the guide groove or guide surface of the guide structure. The front end of the guide rail is provided with a chamfer or guide slope, so that the mold assembly 21 can be smoothly pushed in along the guide structure and maintain linear movement during the pushing process. The mold assembly 21 is provided with locking fittings 211 on both sides that cooperate with the locking assembly 22. The locking fittings 211 are fixed on the outer surfaces of the left and right sides of the mold assembly 21. The locking fittings 211 are spaced apart or continuously arranged along the pushing direction of the mold assembly 21. The top of the locking fittings 211 is provided with a limiting flange for the locking assembly 22 to press the head. When the welding platform 2 is mounted on the base plate of the welding platform 2, it is locked by the locking assembly 22 and the locking mating part 211. After the mold assembly 21 is pushed in along the guide structure of the welding platform 2 and reaches the set welding position, the locking assembly 22 is activated and presses the locking mating part 211. The locking assembly 22 applies a pressing force toward the base plate to the locking mating part 211, fixing the mold assembly 21 on the base plate of the welding platform 2, preventing the mold assembly 21 from shifting position due to welding pressure and ultrasonic vibration during the welding process.

[0029] See Figure 5The locking assembly 22 includes a mounting base, a pneumatic cylinder, a U-shaped clamp hinge, and a linkage clamping arm. The mounting base serves as the fixed foundation for the locking assembly 22. The pneumatic cylinder provides clamping power. The U-shaped clamp hinge converts the extension and retraction motion of the pneumatic cylinder piston rod into the swinging motion of the linkage clamping arm, which transmits the clamping force to the locking mating part 211. The mounting base is fixed to the base plate of the welding platform 2 by bolts and positioning pins. The upper part of the mounting base has a vertically extending support plate and a platform surface for mounting the pneumatic cylinder. The pneumatic cylinder is vertically mounted on the mounting base, with the bottom of the cylinder fixed to the platform surface of the mounting base. The piston rod of the pneumatic cylinder extends vertically upward, and the axis of the pneumatic cylinder is perpendicular to the upper surface of the base plate, so that the thrust output by the pneumatic cylinder is transmitted in the vertical direction. The piston rod of the pneumatic cylinder extends upward, and a U-shaped clamp hinge is fixed to the top of the piston rod. The U-shaped clamp hinge consists of two parallel clamping plates and a connecting base block. A hinge groove is formed between the two parallel clamping plates. The top of the piston rod passes through the connecting base block of the U-shaped clamp hinge and is fixed by a locking nut. The U-shaped clamp hinge moves up and down synchronously with the piston rod. One end of the linkage clamping arm is hinged to the U-shaped clamp hinge and contacts the piston pushed out by the pneumatic cylinder. One end of the linkage clamping arm is the hinge end, which is located in the hinge groove of the U-shaped clamp hinge. The hinge end of the linkage clamping arm is hinged to the U-shaped clamp hinge through a hinge pin. The central axis of the hinge pin is the central axis of the linkage clamping arm's swing. The lower edge of the hinge end of the linkage clamping arm contacts the top of the piston rod of the pneumatic cylinder or the connecting base block of the U-shaped clamp hinge, so that the thrust of the pneumatic cylinder is transmitted to the linkage clamping arm through the contact point. The other end forms a pressing head facing the locking fitting 211. The other end of the linkage pressing arm is a pressing end. The pressing head is formed by bending the pressing end of the linkage pressing arm downwards. The lower edge of the front end of the pressing head is provided with a pressing surface, which is arranged facing the upper surface of the flange of the locking fitting 211. The locking fitting 211 is a U-shaped limiting block. The cross-section of the locking fitting 211 is U-shaped. The wide flange at the top of the locking fitting 211 extends to both sides from the fixing part of the locking fitting 211. The fixing part of the locking fitting 211 is fixed to the side wall of the mold assembly 21 by bolts. The wide flange at the top of the locking fitting 211 provides a clamping and limiting space for the linkage pressing arm.

[0030] When the pneumatic cylinder drives the piston rod to rise, it causes the linkage clamping arm to swing around the central axis of the U-shaped clamp hinge, so that the clamping head of the linkage clamping arm engages with the locking fitting 211, pressing and fixing the locking fitting 211 onto the base plate of the welding platform 2. When the pneumatic cylinder piston rod rises, the U-shaped clamp hinge and the pneumatic cylinder piston rod move upward together, and the hinge end of the linkage clamping arm is also lifted upward. The linkage clamping arm rotates around the central axis of the hinge pin of the U-shaped clamp hinge, and the clamping head of the linkage clamping arm swings downward and engages above the top wide flange of the locking fitting 211, pressing and fixing the locking fitting 211 onto the base plate of the welding platform 2. The pneumatic cylinder can maintain the locking state of the locking assembly 22 on the mold assembly 21 by maintaining the air supply pressure.

[0031] The welding head mounting base 12 is rectangular plate-shaped. The working mounting surface of the welding head mounting base 12 is used to mount two ultrasonic actuators, and the connecting surface of the welding head mounting base 12 is used to connect with the rotating assembly 111. The interior or surface of the welding head mounting base 12 has a weight-reducing structure to improve lightweighting while maintaining bending and torsional stiffness. The welding head mounting base 12 has two symmetrical saddle-shaped blocks 121 on the side facing the rotating assembly 111. Both saddle-shaped blocks 121 are saddle-shaped blocks and are symmetrically arranged on the left and right sides of the connecting surface of the welding head mounting base 12. The opposing inner surfaces of the two saddle-shaped blocks 121 are vertical planes, and a positioning groove is formed between the two inner surfaces. The positioning groove is used to accommodate the connecting plate at the output end of the rotating assembly 111. The output end of the rotating component 111 is provided with a connecting plate, which is a flat plate structure. One side of the connecting plate is fixedly connected to the output flange of the rotating component 111, and the other side and two sides of the connecting plate are used to insert into the positioning groove between the two saddle-shaped blocks 121. The side of the connecting plate is connected to the inner surface of the two saddle-shaped blocks 121, and the two opposite sides of the connecting plate are respectively attached to the inner surface of the two saddle-shaped blocks 121 and fixed by bolts. The two saddle-shaped blocks 121 clamp the connecting plate from both sides, restricting the welding head mounting seat 12 from lateral translation and rotation around the connection direction relative to the connecting plate, so that the rotational motion output by the rotating component 111 is stably transmitted to the welding head mounting seat 12 through the connecting plate.

[0032] The robotic arm 1 is provided in at least two units, which are set on the same side of the welding platform 2. Each robotic arm 1 is provided with a welding head mounting seat 12 and two ultrasonic actuators. At least two robotic arms 1 are respectively mounted on the mounting base on the same side of the welding platform 2. Each robotic arm 1 is independently controlled and can simultaneously or in shifts drive its own welding head mounting seat 12 and two ultrasonic actuators to perform welding processing on different welding areas of the mold assembly 21 on the welding platform 2. Each robotic arm 1 is equipped with a welding head mounting seat 12 and two ultrasonic actuators, so that the lightweight interior and exterior trim ultrasonic flexible welding device can cover more welding points without changing the welding head, thereby improving welding production efficiency.

[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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[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 claims and their equivalents.

Claims

1. A lightweight ultrasonic flexible welding device for interior and exterior trim parts, comprising a robotic arm (1) and a welding platform (2), wherein the end of the robotic arm (1) is provided with a forked end bracket (11), characterized in that: The end of the robotic arm (1) is also provided with a welding head mounting seat (12). The welding head mounting seat (12) is connected to the end bracket (11) of the robotic arm (1) through a rotating component (111). Two ultrasonic actuators are provided on the side facing away from the rotating component (111). The ultrasonic actuators are arranged in a staggered manner on the surface of the welding head mounting seat (12). Each ultrasonic actuator includes a welding head adjustment component (131) and an ultrasonic welding head (13). The rotating component (111) drives the welding head mounting seat (12) to rotate around a preset axis. The welding head adjustment component (131) can adjust the spacing between different ultrasonic welding heads (13) located on the same welding head mounting seat (12). The ultrasonic welding head (13) in the ultrasonic actuator can be disassembled and replaced individually. The robotic arm (1) is set on the side of the welding platform (2). The welding platform (2) is provided with a mold assembly (21). The mold assembly (21) is equipped with plastic parts to be welded. When different plastic parts need to be welded, after replacing the mold assembly (21), the rotation angle of the rotating assembly (111) is adjusted and the welding head spacing is adjusted by the welding head adjustment assembly (131).

2. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 1, characterized in that: The ultrasonic welding head (13) is mounted on the surface of the welding head mounting base (12) via the welding head adjustment assembly (131). The axes of the ultrasonic welding heads (13) in different ultrasonic actuators do not coincide, and the ultrasonic welding heads (13) face opposite directions. When the robotic arm (1) moves the end bracket (11), each ultrasonic actuator independently adjusts the spatial posture and extension distance of the welding end face of the ultrasonic welding head (13) relative to the welding platform (2) below through the corresponding rotating assembly (111) and welding head adjustment assembly (131).

3. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 2, characterized in that: The welding head adjustment assembly (131) includes a track base and a slider. The slider of the welding head adjustment assembly (131) is connected to the ultrasonic welding head (13) and is used to drive the ultrasonic welding head (13) to reciprocate along its own vibration axis.

4. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 3, characterized in that: On the welding head mounting base (12), a zero-position contact block (132) is provided at the tail end of the welding head adjustment assembly (131). When the welding head adjustment assembly (131) drives the ultrasonic welding head (13) to move to the end of the stroke, the zero-position contact block (132) forms a physical contact to prevent the welding head adjustment assembly (131) from continuing to retract.

5. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 3, characterized in that: The welding head adjustment assembly (131) is provided with a linear guide assembly (1311), which includes a guide rod and a guide sleeve. The guide sleeve is provided with an extended wear-resistant copper sleeve inside. The axial length of the wear-resistant copper sleeve along the guide rod is more than 1.5 times the outer diameter of the guide rod.

6. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 2, characterized in that: The welding platform (2) includes a base plate, a guide structure and a locking assembly (22). The base plate is fixedly installed. The guide structure is laid on the upper surface of the base plate. The locking assembly (22) is set on both sides of the upper surface of the base plate. The base plate is a plane for placing the mold assembly (21). The bottom of the mold assembly (21) is provided with a guide rail that slides with the guide structure. The mold assembly (21) is provided with locking fittings (211) on both sides that cooperate with the locking assembly (22). When the welding platform (2) is installed on the base plate of the welding platform (2), it is locked by the locking assembly (22) and the locking fittings (211).

7. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 6, characterized in that: The locking assembly (22) includes a mounting base, a pneumatic cylinder, a U-shaped clamping hinge, and a linkage clamping arm. The mounting base is fixed on the base plate of the welding platform (2). The pneumatic cylinder is vertically mounted on the mounting base. The piston rod of the pneumatic cylinder extends upward, and a U-shaped clamping hinge is fixed at the top of the piston rod. One end of the linkage clamping arm is hinged to the U-shaped clamping hinge and contacts the piston pushed out by the pneumatic cylinder. The other end forms a clamping head facing the locking fitting (211). The locking fitting (211) is a convex-shaped limiting block. When the pneumatic cylinder drives the piston rod to rise, it causes the linkage clamping arm to swing around the central axis of the U-shaped clamp hinge, so that the clamping head of the linkage clamping arm engages with the locking fitting (211), and the locking fitting (211) is pressed and fixed on the base plate of the welding platform (2).

8. The lightweight ultrasonic flexible welding device for interior and exterior trim parts according to claim 2, characterized in that: The welding head mounting base (12) is rectangular plate-shaped. The welding head mounting base (12) has two symmetrical saddle-shaped blocks (121) on the side facing the rotating component (111). The output end of the rotating component (111) is provided with a connecting plate. The side of the connecting plate is connected to the inner surface of the two saddle-shaped blocks (121).

9. A lightweight ultrasonic flexible welding device for interior and exterior trim parts according to any one of claims 2-8, characterized in that: The robotic arm (1) is provided in at least two units, and the robotic arm (1) is set on the same side of the welding platform (2). Each robotic arm (1) is provided with a welding head mounting seat (12) and two ultrasonic actuators.

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