Coating part ultrasonic welding equipment and welding method

Abstract

The invention relates to the technical field of electric automobile plastic coating part welding, in particular to coating part ultrasonic welding equipment and method.The equipment comprises first mounting plates, transverse limiting assemblies are arranged on the first mounting plates, and a first sliding groove is formed between the two first mounting plates; first sliding blocks are symmetrically arranged in the first sliding groove in a sliding mode and are perpendicular to the transverse limiting assembly, second mounting plates are symmetrically arranged at the front end and the rear end of the first sliding groove, longitudinal limiting assemblies are arranged on the second mounting plates, first clamping rods are symmetrically arranged on the first sliding blocks, and longitudinal limiting assemblies are arranged on the second mounting plates and located between the first clamping rods; the transverse limiting assembly comprises a transverse extrusion block, a transverse sliding groove is transversely formed in the middle of the first mounting plate, a first spring is arranged in the transverse sliding groove, and the transverse extrusion block is slidably connected into the transverse sliding groove through the first spring. A longitudinal movable groove larger than the transverse extrusion block is formed in the end, close to the first sliding groove, of the transverse sliding groove in the first mounting plate.

Description

Technical Field

[0001] The invention relates to the technical field of welding of plastic painted parts of electric vehicles, and in particular to ultrasonic welding equipment and a welding method for painted parts. Background Art

[0002] Electric vehicles have increasing requirements for lightweight, comfort and safety, and plastics have the advantages of light weight, good feel and simple molding process, so the proportion of plastic parts in electric vehicles is increasing; electric vehicle plastic coating parts are an important part of electric vehicle manufacturing. They not only have a decorative effect, but also have the function of protecting plastic parts from external environmental erosion; ultrasonic welding is an advanced assembly technology that uses the energy of high-frequency vibration waves (usually ultrasonic frequencies exceeding 15KHz) to produce plastic deformation on the surface of the workpiece and destroy the surface layer under pressure, so that the surfaces of the two objects rub against each other to form a fusion between the molecular layers, thereby achieving welding.

[0003] In the existing ultrasonic welding equipment for electric vehicle plastic coated parts, in actual use, when the ultrasonic welding device is used to weld the longitudinal seam of two pieces of electric vehicle plastic coated parts, the thickness is not squeezed, which can easily cause cracks in the thickness of the weld or an unqualified appearance; secondly, traditional ultrasonic welding applies a balanced squeezing force to the longitudinal weld. Since the weld will melt and deform immediately after the ultrasonic output, the force application is delayed or does not meet the squeezing force requirement at the weld, resulting in an unqualified appearance of the weld or welding.

[0004] Based on this, the present invention discloses an ultrasonic welding device and a welding method for a painted part. Summary of the invention

[0005] In order to solve the problem raised in the background technology, the present invention provides an ultrasonic welding device for a coated part, which includes a mounting frame, a workbench is arranged on the mounting frame, and an ultrasonic welding device is arranged on the workbench; Preferably, the workbench is symmetrically provided with first mounting plates on both sides of the ultrasonic welding device, a transverse limiting assembly is provided on the first mounting plates, a first slide groove is formed between the two first mounting plates, a first slider is symmetrically provided in the first slide groove and slides perpendicularly to the transverse limiting assembly, a second mounting plate is symmetrically provided at the front and rear ends of the first slide groove, a servo motor is provided on the second mounting plate adjacent to one side of the ultrasonic welding device, a bidirectional threaded screw is provided at the output end of the servo motor, the first slider is respectively provided at both ends of the bidirectional threaded screw, a longitudinal limiting assembly is provided on the second mounting plate, a first clamping rod is symmetrically provided on the first slider, and a longitudinal limiting assembly is provided on the second mounting plate between the first clamping rods; The lateral limiting assembly includes a lateral extrusion block, a lateral slide groove is transversely opened in the middle position of the first mounting plate, a first spring is arranged in the lateral slide groove, the lateral extrusion block is slidably connected in the lateral slide groove through the first spring, and a longitudinal movable groove larger than the lateral extrusion block is opened at one end of the first mounting plate located near the first slide groove.

[0006] As a further improvement of the technical solution, longitudinal sliding grooves are symmetrically opened on the first mounting plate on both sides of the longitudinal movable groove, and a longitudinal extrusion block is slidably connected in the longitudinal sliding groove. A second spring is arranged in the longitudinal extrusion block, and one end of the second spring is fixedly connected to the inner wall of the longitudinal sliding groove, and the other end is fixedly connected to the longitudinal extrusion block.

[0007] As a further improvement of the technical solution, a suction cup is fixedly provided on the transverse extrusion block for adsorbing the plastic painted parts of the electric vehicle, and an air pump for driving the suction cup is arranged in the mounting frame.

[0008] As a further improvement of the technical solution, a limit block is fixedly provided in the first slide groove just in front of the transverse extrusion block for limiting the transverse extrusion block.

[0009] Preferably, both sides of the transverse extrusion block and the longitudinal extrusion block are smooth structures.

[0010] As a further improvement of the technical solution, a second sliding groove adapted to the limiting block is provided in the first sliding block on a side opposite to the two first sliding blocks.

[0011] Preferably, the longitudinal limit assembly comprises a first cylinder, the first cylinder is fixedly connected to the second mounting plate, a second cylinder is fixedly connected to the second mounting plate above the first cylinder, and ends of the first cylinder and the second cylinder are connected to each other; The telescopic end of the first cylinder is fixedly connected to the first sliding block, the telescopic end of the second cylinder is fixedly connected to the third mounting plate, the third mounting plate is located on a side opposite to the third mounting plate and is evenly fixed with a plurality of elastic telescopic rods, the third mounting plate is slidably connected to a longitudinal extrusion plate, and the longitudinal extrusion plate is connected to the third mounting plate through the telescopic end of the elastic telescopic rod.

[0012] As a further improvement of the technical solution, a longitudinal extrusion opening is formed between the two first clamping rods on the first slider, the width of the longitudinal extrusion opening is adapted to the width of the welding end of the ultrasonic welding device, and the width of the longitudinal extrusion plate is adapted to the width of the longitudinal extrusion opening; In the initial stage, the longitudinal extrusion plate is located on a side of the first clamping rod away from the transverse extrusion block.

[0013] Preferably, when the opposite sides of the two first sliding blocks are respectively located on both sides of the longitudinal movable groove, the longitudinal extrusion plate is located on a side of the first clamping rod adjacent to the transverse extrusion block.

[0014] As a further improvement of the present technical solution, in the initial stage, the transverse extrusion block is located at the intersection of the transverse slide groove and the longitudinal movable groove, the transverse extrusion block is in contact with the longitudinal extrusion blocks on both sides thereof, and the transverse extrusion block is in contact with one side of the first sliding block.

[0015] The second object of the present invention is to provide a welding method for the ultrasonic welding device for coating parts, the steps of which include: S1. Place two plastic coated parts of electric vehicles on the suction cup to ensure the longitudinal alignment of the welding seams, and then start the servo motor so that the first clamping rod pre-clamps the plastic coated parts of the electric vehicle to ensure the transverse alignment of the welding seams, thereby completing the pre-clamping and fixing of the two plastic coated parts of the electric vehicle; S2, start the air pump to drive the suction cup to absorb and fix the plastic painted part of the electric vehicle, start the servo motor to make the first slider move in opposite directions, drive the longitudinal extrusion plate to replace the first clamping rod to clamp and fix the plastic painted part of the electric vehicle; S3. When the longitudinal extrusion plate clamps and fixes the plastic coated parts of the electric vehicle, the first slider releases the limit of the transverse extrusion block, so that the transverse extrusion block can move transversely and longitudinally in the transverse slide groove and the longitudinal movable groove, and cooperates with the longitudinal extrusion plate to complete the transverse and longitudinal dynamic extrusion of the plastic coated parts of the electric vehicle during the welding process. Compared with the prior art, the present invention has the following beneficial effects: 1. This ultrasonic welding equipment and welding method for painted parts provide pre-fixation and lateral and longitudinal alignment. Through the cooperation of the first clamping rod and the suction cup, two pieces of electric vehicle plastic painted parts are pre-fixed, the painted parts are placed on the suction cup, and the suction force of the suction cup is used for preliminary fixation. The longitudinal alignment of the weld is maintained by clamping the first clamping rod, ensuring the stability of the painted parts and the alignment of the weld before welding, laying the foundation for the subsequent welding process.

[0016] 2. In this ultrasonic welding equipment and welding method for coated parts, dynamic extrusion force is provided. The setting of the first spring and the elastic telescopic rod, in conjunction with the opening of the longitudinal movable groove, allows the lateral extrusion block to have space for displacement in the lateral and longitudinal directions, ensuring that the welded part also has space for displacement in the lateral and longitudinal directions. In addition, the first spring and the elastic telescopic rod ensure that the longitudinal weld seam and the weld seam at the thickness of the welded part are quickly subjected to corresponding longitudinal and lateral dynamic extrusion forces after the weld melts, thereby ensuring smooth completion of the welding.

[0017] 3. This ultrasonic welding equipment and method for painted parts provide lateral and longitudinal displacement space. By setting a lateral slide groove, a longitudinal movable groove, a first spring and a second spring, lateral and longitudinal displacement space is provided for the painted parts during the welding process. During the welding process, the painted parts can have a certain displacement in the lateral slide groove and the longitudinal movable groove while being subjected to extrusion force, replacing the traditional fixed extrusion or directly placing it in the mold, which results in limited displacement space for the welded parts and cannot maximize the effect of ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the lateral limit assembly of the present invention; Figure 3 It is a top view of the structure of the lateral limiting assembly of the present invention; Figure 4 It is a structural schematic diagram of the first mounting plate of the present invention; Figure 5 for Figure 4 A magnified view of the structure at center A; Figure 6 This is a structural schematic diagram of the longitudinal limit assembly of the present invention; Figure 7 The second structural schematic diagram of the longitudinal limit assembly of the present invention; Figure 8 This is a state schematic diagram of the longitudinal limit assembly of the present invention; Fig. 9 The second state schematic diagram of the longitudinal limit assembly of the present invention; Fig.10 for Fig. 9 A magnified view of the structure at point B.

[0019] The meaning of each number in the figure is: 1. Mounting frame; 2. Ultrasonic welding device; 3. Workbench; 4. First mounting plate; 5. First slide; 6. Horizontal limit assembly; 7. First slider; 8. Longitudinal limit assembly; 9. Horizontal slide; 10. Longitudinal slide; 11. Longitudinal movable groove; 12. Bidirectional threaded screw; 13. First clamping rod; 14. Second mounting plate; 15. Servo motor; 16. Second slide; 17. Longitudinal extrusion port; 61. lateral extrusion block; 62. first spring; 63. suction cup; 64. second spring; 65. longitudinal extrusion block; 66. limit block; 81. First cylinder; 82. Second cylinder; 83. Third mounting plate; 84. Longitudinal extrusion plate; 85. Elastic telescopic rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] When the existing ultrasonic welding device 2 is used to weld the longitudinal seams of two plastic coated parts of electric vehicles, the thickness is not squeezed, which may easily cause cracks in the weld seam at the thickness or an unqualified appearance; secondly, traditional ultrasonic welding applies a balanced squeezing force to the longitudinal weld seam, and the application of the force is delayed or does not meet the squeezing force requirement at the weld seam, resulting in an unqualified appearance of the weld seam or welding.

[0022] To this end, the present invention provides a coating part ultrasonic welding device, see Figure 1-Figure 3 As shown, it includes a mounting frame 1, a workbench 3 is arranged on the mounting frame 1, and an ultrasonic welding device 2 is arranged on the workbench 3; first mounting plates 4 are symmetrically arranged on both sides of the ultrasonic welding device 2 on the workbench 3, and a lateral limiting component 6 is arranged on the first mounting plate 4, and a first slide groove 5 is formed between the two first mounting plates 4.

[0023] For details, see Figure 2-Figure 3As shown, the lateral limiting assembly 6 includes a lateral extrusion block 61, a lateral slide groove 9 is transversely opened in the middle position of the first mounting plate 4, a first spring 62 is arranged in the lateral slide groove 9, the lateral extrusion block 61 is slidably connected in the lateral slide groove 9 through the first spring 62, and a longitudinal movable groove 11 larger than the lateral extrusion block 61 is opened at one end of the lateral slide groove 9 adjacent to the first slide groove 5 on the first mounting plate 4; a suction cup 63 is fixed on the lateral extrusion block 61 for adsorbing the plastic coating parts of the electric vehicle, and an air pump for driving the suction cup 63 is arranged in the mounting frame 1; longitudinal slide grooves 10 are symmetrically opened on both sides of the longitudinal movable groove 11 on the first mounting plate 4, a longitudinal extrusion block 65 is slidably connected in the longitudinal slide groove 10, a second spring 64 is arranged in the longitudinal extrusion block 65, one end of the second spring 64 is fixedly connected to the inner wall of the longitudinal slide groove 10, and the other end is fixedly connected to the longitudinal extrusion block 65.

[0024] For further information, see Figure 4-Figure 6 As shown, a first slider 7 is symmetrically slidably arranged in the first slide groove 5 perpendicular to the transverse limit assembly 6, and second mounting plates 14 are symmetrically arranged at the front and rear ends of the first slide groove 5. A servo motor 15 is arranged on the second mounting plate 14 on the side adjacent to the ultrasonic welding device 2, and a bidirectional threaded screw 12 is arranged at the output end of the servo motor 15. The first slider 7 is respectively arranged at both ends of the bidirectional threaded screw 12, and a limit block 66 is fixedly arranged in the first slide groove 5 just in front of the transverse extrusion block 61 for limiting the transverse extrusion block 61; and a second slide groove 16 adapted to the limit block 66 is opened in the first slider 7 on the side opposite to the two first sliders 7; secondly, both sides of the transverse extrusion block 61 and the longitudinal extrusion block 65 are smooth structures.

[0025] It is worth mentioning that see Figure 5 As shown, in the initial stage, the transverse extrusion block 61 is located at the intersection of the transverse slide groove 9 and the longitudinal movable groove 11, the transverse extrusion block 61 is in contact with the longitudinal extrusion blocks 65 on both sides thereof, and the transverse extrusion block 61 is in contact with one side of the first slider 7.

[0026] For further information, see Figure 1 and Figure 4-Figure 7 As shown, a longitudinal limit assembly 8 is provided on the second mounting plate 14, first clamping rods 13 are symmetrically provided on the first slider 7, and a longitudinal limit assembly 8 is provided on the second mounting plate 14 between the first clamping rods 13; For details, see Figure 6-Figure 7 As shown, the longitudinal limit assembly 8 includes a first cylinder 81, the first cylinder 81 is fixedly connected to the second mounting plate 14, a second cylinder 82 is fixedly connected to the second mounting plate 14 above the first cylinder 81, and the ends of the first cylinder 81 and the second cylinder 82 are connected to each other; The telescopic end of the first cylinder 81 is fixedly connected to the first slider 7, and the telescopic end of the second cylinder 82 is fixedly connected to the third mounting plate 83. The third mounting plate 83 is located on the side opposite to the opposite third mounting plate 83 and is evenly fixed with a plurality of elastic telescopic rods 85. The third mounting plate 83 is slidably connected to a longitudinal extrusion plate 84, and the longitudinal extrusion plate 84 is connected to the third mounting plate 83 through the telescopic end of the elastic telescopic rod 85.

[0027] For further information, see Figure 1 and Figure 6 As shown, a longitudinal extrusion opening 17 is formed between the two first clamping rods 13 on the first slider 7 , the width of the longitudinal extrusion opening 17 is adapted to the width of the welding end of the ultrasonic welding device 2 , and the width of the longitudinal extrusion plate 84 is adapted to the width of the longitudinal extrusion opening 17 .

[0028] It is worth mentioning that see Figure 6-Figure 10 As shown, in the initial stage, the longitudinal extrusion plate 84 is located on the side of the first clamping rod 13 away from the transverse extrusion block 61; and when the opposite sides of the two first sliders 7 are respectively located on both sides of the longitudinal movable groove 11, the longitudinal extrusion plate 84 is located on the side of the first clamping rod 13 close to the transverse extrusion block 61.

[0029] Working principle: In the initial state, there is a gap between the two opposite first sliders 7, but the first slider 7 is still in contact with the transverse extrusion block 61 to maintain the limit of the transverse extrusion block 61; then the two pieces of electric vehicle plastic coated parts to be welded are placed on the two suction cups 63 respectively, and then the welds of the two pieces of electric vehicle plastic coated parts to be welded are kept longitudinally aligned, and then the servo motor 15 is started to cause the bidirectional threaded screw 12 to rotate. Since the bidirectional threaded screw 12 is a bidirectional thread setting, the first sliders 7 at both ends of the bidirectional threaded screw 12 will move toward or away from each other. When the two pieces of electric vehicle plastic coated parts to be welded are first placed on the suction cups 63 respectively, the suction cups 63 will adsorb and pre-fix the electric vehicle plastic coated parts to be welded, and then the servo motor 15 drives the two first sliders 7 to move toward each other, thereby clamping and fixing the welds of the two pieces of electric vehicle plastic coated parts to be welded, so that the welds of the two pieces of electric vehicle plastic coated parts to be welded are kept aligned and pre-fixed.

[0030] After the weld seams are aligned and pre-fixed, the air pump is started, so that the two suction cups 63 strongly adsorb the two pieces of electric vehicle plastic coated parts to be welded thereon to achieve a stable fixing effect, ensuring that the weld seams of the two pieces of electric vehicle plastic coated parts to be welded are longitudinally aligned, and after the longitudinal pre-clamping of the first clamping rod 13, combined with the strong adsorption of the suction cup 63, the two pieces of electric vehicle plastic coated parts to be welded are also horizontally aligned, ensuring that the weld seams are horizontally and vertically aligned, paving the way for the next step of welding; then the servo motor 15 is started again to rotate it in the opposite direction, thereby driving the two first sliders 7 to move in opposite directions. When moving in the opposite direction, the first slider 7 will squeeze the telescopic end of the corresponding first cylinder 81 respectively, thereby causing the telescopic end of the second cylinder 82 connected thereto to extend, and then the third mounting plate 83 on the telescopic end of the second cylinder 82 will approach the two pieces of electric vehicle plastic coated parts to be welded, until finally the longitudinal extrusion plates 84 on both sides of the two pieces of electric vehicle plastic coated parts to be welded are fitted therewith, and then the first slider 7 continues to move away from each other for a distance to ensure that the longitudinal extrusion plates 84 are in a certain compression state, thereby ensuring that the longitudinal extrusion plates 84 on both sides of the coated parts can extrude and fix the two pieces of electric vehicle plastic coated parts to be welded.

[0031] At this time, as mentioned above, it can be known that the longitudinal extrusion plate 84 is located on the side of the first clamping rod 13 adjacent to the transverse extrusion block 61, that is, the longitudinal extrusion plate 84 replaces the first clamping rod 13 to longitudinally extrude and fix the two pieces of electric vehicle plastic coated parts to be welded, and because the longitudinal extrusion plate 84 is slidably connected to the third mounting plate 83 through the elastic telescopic rod 85, it ensures that the two pieces of electric vehicle plastic coated parts to be welded are longitudinally clamped and fixed, and it can also ensure that the two pieces of electric vehicle plastic coated parts to be welded have a certain degree of longitudinal displacement, thus providing a certain longitudinal movement space for the parts to be welded for ultrasonic welding, and at the same time, it can ensure that the thickness of the weld seam can be squeezed by the longitudinal extrusion plate 84, so as to ensure that the thickness of the weld seam is welded, and prevent the thickness from not being squeezed after ultrasonic welding, causing the weld seam to crack or not be welded in place.

[0032] Combining the above-mentioned process of the first slider 7 moving in opposite directions, it can be known that when the longitudinal extrusion plate 84 is located on the side of the first clamping rod 13 adjacent to the transverse extrusion block 61, as shown in FIG. Figure 8 and Fig.10It can be seen that the two first sliders 7 are located on both sides of the longitudinal movable groove 11, that is, at this time, the first slider 7 is no longer in contact with the transverse extrusion block 61, and will not align to cause extrusion limitation, thus providing a transverse extrusion fixing force and a transverse displacement space for the suction cups 63 corresponding to the two pieces of electric vehicle plastic coated parts to be welded, because in the initial state, the transverse and longitudinal alignment of the welds of the two pieces of electric vehicle plastic coated parts to be welded has been ensured, but when welding, since the weld seam is melted by high temperature friction, the two pieces of electric vehicle plastic coated parts to be welded will also have a certain transverse displacement requirement in the transverse direction, at this time, since the first slider 7 releases the limitation of the transverse extrusion block 61 Since the lateral extrusion block 61 is slidably connected in the lateral slide groove 9 through the first spring 62, the lateral extrusion blocks 61 on both sides of the first slide groove 5 will drive the suction cup 63 to have a certain displacement space in the lateral direction. At the same time, due to the existence of the first spring 62, it is ensured that when the two pieces of electric vehicle plastic coated parts to be welded are strongly adsorbed by the suction cup 63, under the drive of the lateral extrusion block 61, the welding seams always have a tendency to remain aligned, that is, the two sides of the two pieces of electric vehicle plastic coated parts to be welded are always subjected to lateral extrusion force. In this way, when the welding seam melts, due to the existence of the first spring 62, the lateral extrusion force can be dynamically and timely and effectively applied to the welding seam to ensure the welding alignment of the welding seam.

[0033] At the same time, the longitudinal extrusion blocks 65 on both sides of the transverse extrusion block 61 limit the transverse extrusion block 61 longitudinally. However, due to the provision of the longitudinal movable groove 11, and the longitudinal extrusion block 65 is slidably connected to the longitudinal slide groove 10 through the second spring 64, and the longitudinal movable groove 11 is larger than the size of the transverse extrusion block 61, the transverse extrusion block 61 can have a certain longitudinal displacement space in the longitudinal movable groove 11, and can also cooperate with the longitudinal extrusion plate 84 to achieve a certain longitudinal displacement space, ensuring that the weldment has a certain longitudinal displacement space during ultrasonic welding; The longitudinal extrusion blocks 65 symmetrically arranged on both sides of the transverse extrusion block 61 are to ensure that the transverse extrusion block 61 can always be placed in the transverse chute 9 in the transverse direction. That is to say, even if the transverse extrusion block 61 has a certain longitudinal displacement, it will return to the transverse chute 9, that is, the intersection of the transverse chute 9 and the longitudinal movable groove 11. Figure 5 and Fig.10 It can be seen from the comparison that when the first slider 7 is located on both sides of the longitudinal movable groove 11, the limit block 66 also slides out from the second slide groove 16. The setting of the limit block 66 is to prevent the lateral displacement of the lateral extrusion block 61 from being too large, causing damage to the welding seam, and also to facilitate the resetting of the first slider 7 when the welding is completed in the next step.

[0034] The suction cup 63 here can also ensure that the surface of the entire weldment is protected from unnecessary wear due to the lateral squeezing force, and as for the thickness direction of the weldment, the influence on its appearance can be ignored due to the thinness of the thickness.

[0035] It is worth noting that in the traditional ultrasonic welding process, the welding is achieved by relying on balanced extrusion pressure, which cannot ensure that the corresponding extrusion pressure can be timely applied to complete the welding after the welding seam melts and deforms. In the present invention, in addition to first solving the problem that the welding seam at the thickness is subjected to timely and effective extrusion pressure, the movable transverse extrusion blocks 61 on both sides drive the suction cups 63 to ensure that the welding seam is always subjected to dynamic transverse extrusion pressure. In other words, in the present invention, the welding seams at the thickness and longitudinal directions are all elastically and retractably arranged to ensure that the welding seams are always subjected to dynamic extrusion pressure, thereby ensuring that once the welding seam melts, extrusion pressure will be immediately generated to complete the welding. At the same time, ultrasonic welding provides transverse and longitudinal displacement space for the welded parts, replacing the traditional method of fixing and extruding the welded parts through constant or delayed extrusion pressure or through a mold.

[0036] When welding is completed, the air pump is started to release the suction cup 63 from adsorbing the welded part, and then the servo motor 15 is started to release the longitudinal extrusion plate 84 from squeezing the welded part. However, even if the first clamping rod 13 moves toward each other at this time, it does not squeeze the welded part, so the welded part can be taken out at this time; after taking it out, the servo motor 15 can be started again to cause the first slider 7 to move toward each other until it is reset. During the resetting process of the first slider 7, the transverse extrusion block 61 has been pressed against the limit block 66 due to the action of the first spring 62, so the limit block 66 can play a role in limiting the transverse extrusion block 61. Fig.10 , ensuring that the smooth surface of the transverse extrusion block 61, that is, the surface with a certain wedge-shaped structure, faces the first slider 7, so that when the first slider 7 is reset, it will squeeze the transverse extrusion block 61 to reset into the longitudinal movable groove 11, that is, the intersection of the transverse slide groove 9 and the longitudinal movable groove 11. At this time, the limit block 66 also enters the second slide groove 16.

[0037] In summary, the two pieces of electric vehicle plastic coated parts are pre-fixed by the first clamping rod 13 and the suction cup 63 to ensure the longitudinal and thickness alignment of the welding seam, and then the air pump is used to ensure the strong adsorption of the welding part by the suction cup 63, and then the servo motor 15 drives the bidirectional threaded screw 12 to cause the first slider 7 to move in opposite directions, so that the longitudinal extrusion plate 84 replaces the first clamping rod 13 to limit the welding part in the longitudinal direction, and the first spring 62 and the elastic telescopic rod 85 are set, and the longitudinal movable groove 11 is opened, so that the transverse extrusion block 61 has space for displacement in the transverse and longitudinal directions, ensuring that the welding part also has space for displacement in the transverse and longitudinal directions, and the first spring 62 and the elastic telescopic rod 85 ensure that the longitudinal welding seam and the welding seam at the thickness of the welding part are quickly subjected to the corresponding longitudinal and transverse dynamic extrusion force after the welding melts, ensuring the smooth completion of welding; This effectively solves the problem that when the existing ultrasonic welding device 2 is used to weld the longitudinal seams of two plastic coated parts of electric vehicles, the thickness is not squeezed, which may easily cause cracks in the weld seam at the thickness or an unqualified appearance; secondly, traditional ultrasonic welding applies a balanced squeezing force to the longitudinal weld seam, and the application of the force is delayed or does not meet the requirement of squeezing force at the weld seam, resulting in the appearance of the weld seam or the welding being unqualified.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An ultrasonic welding device for a coated part, comprising a mounting frame (1), a workbench (3) being arranged on the mounting frame (1), and an ultrasonic welding device (2) being arranged on the workbench (3), characterized in that: The workbench (3) is symmetrically provided with first mounting plates (4) on both sides of the ultrasonic welding device (2), and a transverse limiting assembly (6) is provided on the first mounting plates (4). A first slide groove (5) is formed between the two first mounting plates (4), and a first slider (7) is symmetrically slidably provided in the first slide groove (5) perpendicular to the transverse limiting assembly (6). Second mounting plates (14) are symmetrically provided at the front and rear ends of the first slide groove (5), and a servo motor (15) is provided on the second mounting plate (14) adjacent to the side of the ultrasonic welding device (2). A bidirectional threaded screw (12) is provided at the output end of the servo motor (15), and the first slider (7) is respectively provided at both ends of the bidirectional threaded screw (12). A longitudinal limiting assembly (8) is provided on the second mounting plate (14), and first clamping rods (13) are symmetrically provided on the first slider (7). A longitudinal limiting assembly (8) is provided on the second mounting plate (14) between the first clamping rods (13); The transverse limiting assembly (6) comprises a transverse extrusion block (61); a transverse slide groove (9) is transversely provided at a middle position on the first mounting plate (4); a first spring (62) is provided in the transverse slide groove (9); the transverse extrusion block (61) is slidably connected in the transverse slide groove (9) via the first spring (62); and a longitudinal movable groove (11) larger than the transverse extrusion block (61) is provided at one end of the transverse slide groove (9) adjacent to the first slide groove (5) on the first mounting plate (4).

2. The ultrasonic welding equipment for coated parts according to claim 1, characterized in that: The first mounting plate (4) is provided with longitudinal sliding grooves (10) symmetrically disposed on both sides of the longitudinal movable groove (11); a longitudinal extrusion block (65) is slidably connected in the longitudinal sliding groove (10); a second spring (64) is arranged in the longitudinal extrusion block (65); one end of the second spring (64) is fixedly connected to the inner wall of the longitudinal sliding groove (10), and the other end is fixedly connected to the longitudinal extrusion block (65); Both sides of the transverse extrusion block (61) and the longitudinal extrusion block (65) are of smooth structure.

3. The ultrasonic welding equipment for painted parts according to claim 1, characterized in that: A suction cup (63) is fixedly provided on the transverse extrusion block (61) for adsorbing the plastic painted parts of the electric vehicle, and an air pump for driving the suction cup (63) is provided in the mounting frame (1).

4. The ultrasonic welding equipment for painted parts according to claim 1, characterized in that: A limiting block (66) is fixedly provided in the first sliding groove (5) in front of the transverse extrusion block (61) for limiting the position of the transverse extrusion block (61).

5. The ultrasonic welding equipment for coated parts according to claim 4, characterized in that: A second sliding groove (16) adapted to the limiting block (66) is provided in the first sliding block (7) on a side opposite to the two first sliding blocks (7).

6. The ultrasonic welding equipment for painted parts according to claim 1, characterized in that: The longitudinal limiting assembly (8) comprises a first cylinder (81), the first cylinder (81) being fixedly connected to the second mounting plate (14), a second cylinder (82) being fixedly connected to the second mounting plate (14) above the first cylinder (81), and the ends of the first cylinder (81) and the second cylinder (82) being connected to each other; The telescopic end of the first cylinder (81) is fixedly connected to the first sliding block (7); the telescopic end of the second cylinder (82) is fixedly connected to a third mounting plate (83); a plurality of elastic telescopic rods (85) are evenly fixedly provided on the side of the third mounting plate (83) opposite to the third mounting plate (83); a longitudinal extrusion plate (84) is slidably connected to the third mounting plate (83); the longitudinal extrusion plate (84) is connected to the third mounting plate (83) via the telescopic ends of the elastic telescopic rods (85).

7. The ultrasonic welding equipment for painted parts according to claim 6, characterized in that: A longitudinal extrusion opening (17) is formed between the two first clamping rods (13) on the first sliding block (7), the width of the longitudinal extrusion opening (17) being adapted to the width of the welding end of the ultrasonic welding device (2), and the width of the longitudinal extrusion plate (84) being adapted to the width of the longitudinal extrusion opening (17); In the initial stage, the longitudinal extrusion plate (84) is located on a side of the first clamping rod (13) away from the transverse extrusion block (61).

8. The ultrasonic welding equipment for painted parts according to claim 7, characterized in that: When the opposite sides of the two first sliding blocks (7) are respectively located on both sides of the longitudinal movable groove (11), the longitudinal extrusion plate (84) is located on the side of the first clamping rod (13) adjacent to the transverse extrusion block (61).

9. The ultrasonic welding equipment for coated parts according to claim 2, characterized in that: In the initial stage, the transverse extrusion block (61) is located at the intersection of the transverse slide groove (9) and the longitudinal movable groove (11), the transverse extrusion block (61) is in contact with the longitudinal extrusion blocks (65) on both sides thereof, and the transverse extrusion block (61) is in contact with one side of the first sliding block (7).

10. A welding method for the ultrasonic welding equipment for painted parts according to any one of claims 1 to 9, characterized in that: It includes the following steps: S1, placing two pieces of electric vehicle plastic coated parts on the suction cup (63), ensuring that the longitudinal welding seams are aligned, and then starting the servo motor (15) so that the first clamping rod (13) pre-clamps the electric vehicle plastic coated parts, ensuring that the welding seams are aligned transversely, and completing the pre-clamping and fixing of the two pieces of electric vehicle plastic coated parts; S2, starting the air pump to drive the suction cup (63) to absorb and fix the plastic painted part of the electric vehicle, starting the servo motor (15), causing the first slider (7) to move in opposite directions, driving the longitudinal extrusion plate (84) to replace the first clamping rod (13) to clamp and fix the plastic painted part of the electric vehicle; S3. When the longitudinal extrusion plate (84) clamps and fixes the electric vehicle plastic coated part, the first slide block (7) releases the limit on the transverse extrusion block (61), so that the transverse extrusion block (61) can move transversely and longitudinally in the transverse slide groove (9) and the longitudinal movable groove (11), and cooperates with the longitudinal extrusion plate (84) to complete the transverse and longitudinal dynamic extrusion of the electric vehicle plastic coated part during the welding process.

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