Inverter busbar laser automatic welding system

Abstract

The utility model aims to provide the automatic laser welding system for the inverter busbar, which is high in automation degree, accurate in welding spot positioning, high in welding quality and free of misoperation. The system comprises a welding room (1), a laser (2), a cooling-water machine (3), an industrial personal computer (4) and a laser welding head (5), the laser welding head is connected with the laser device, a workbench (6) is arranged in the welding room, a first station (7) and a second station (8) are arranged on the workbench, a first welding clamp (9) and a second welding clamp (10) are arranged on the first station and the second station respectively, a scanning device is connected to the industrial personal computer, and the industrial personal computer is connected with the laser device. An XYZ-axis moving mechanism is further arranged on the workbench, the laser welding head is arranged on the XYZ-axis moving mechanism, and a 2D galvanometer system, a CCD camera and a laser range finder are arranged on the XYZ-axis moving mechanism at the same time. The device can be applied to the technical field of automatic welding.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic welding, in particular to a laser automatic welding system for an inverter busbar. Background Art

[0002] With the development of technology, automation and refinement have become an inescapable problem in the processing field. The higher the degree of equipment automation and the higher the processing accuracy, the higher the possibility of winning the favor of customers. On the contrary, it is easy to gradually lose competitiveness.

[0003] In one specific field of the processing field - welding, especially laser welding, the structure of traditional laser welding devices is simple. Generally, two parts to be processed are spliced to form a welding station, and the welding head is used to perform welding treatment on the welding station to fix the two parts.

[0004] The position of the existing welding head is mostly adjusted manually by workers according to the position of the welding station formed when different parts are spliced, resulting in inaccurate alignment of the welding head and processing errors in the processed products, which affects the later use of the parts. In large-scale production and manufacturing, some enterprises also use automated equipment for welding, such as the frame assembly welding in the automotive manufacturing process. For the welding between large parts such as automotive frames, the welding position is monitored by CDD, and generally the welding accuracy requirements can be met. However, for some small workpieces that require welding at multiple different positions in the same station, most cases are currently completed by combining manual labor and the laser head. But the welding quality still depends on the proficiency of the workers. In the case of large-scale production, due to the participation of human factors, it is extremely easy to cause problems such as uneven welding quality and low efficiency of products. In addition, since it is the welding of multiple workpieces in the same station, there will definitely be production quality differences between each workpiece. Different welding powers and welding methods need to be considered according to material factors during welding, but the current welding devices pay little attention to this aspect. In addition, due to the existence of human factors, there are still catastrophic welding accidents such as incorrect welding positions, which will directly lead to the scrapping of the welded workpieces.

[0005] Therefore, it is urgent to design a new welding system to solve the above problems. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a laser automatic welding system for an inverter busbar with high automation, accurate solder joint positioning, high welding quality, and no misoperation.

[0007] The technical solution adopted by the laser automatic welding system for the inverter busbar of the present utility model is a laser automatic welding system for the inverter busbar. The inverter busbar is composed of a magnetic ring, a first busbar, a second busbar, a third busbar, and a fourth busbar. The first busbar and the second busbar are first inserted into the magnetic ring. The first busbar is connected to the third busbar by welding, and the second busbar is connected to the fourth busbar by welding. The automatic welding system includes

[0008] A welding room for isolating the laser welding working area;

[0009] A laser for providing laser welding work;

[0010] A chiller for cooling the laser;

[0011] An industrial control computer disposed on the welding room for controlling the welding work;

[0012] And a laser welding head;

[0013] The laser welding head is connected to the laser. A workbench is provided in the welding room. A first working station and a second working station are provided on the workbench. A first welding fixture and a second welding fixture are respectively provided on the first working station and the second working station. A scanning device is connected to the industrial control computer. A workpiece identification code is provided on each workpiece of the inverter busbar. Fixture identification codes corresponding to the workpiece identification code are also provided on the first welding fixture and the second welding fixture. The scanning device matches and corresponds each workpiece of the inverter busbar with the first welding fixture and the second welding fixture through the workpiece identification code and the fixture identification code;

[0014] An XYZ-axis moving mechanism is further provided on the workbench. The laser welding head is disposed on the XYZ-axis moving mechanism,

[0015] A 2D galvanometer system, a CCD camera, and a laser rangefinder are simultaneously provided on the XYZ-axis moving mechanism;

[0016] The laser, the chiller, the laser welding head, the XYZ-axis moving mechanism, the 2D galvanometer system, the CCD camera, and the laser rangefinder are all electrically connected to the industrial control computer. The industrial control computer is electrically connected to a background control system provided peripherally. A laser shielding safety door is provided at the front end of the workbench.

[0017] As can be seen from the above solution, in the present utility model, the industrial control computer is used to coordinately control the welding room, the laser, the chiller, and the laser welding head respectively to achieve the automatic control of the entire system; a 2D galvanometer system, a CCD camera, and a laser rangefinder are simultaneously arranged on the XYZ-axis moving mechanism. Among them, the multi-mode laser controls low-spatter welding, the 2D galvanometer system realizes large-area scanning and one-time multi-weld scanning, the laser rangefinder is convenient for measuring the welding height before each welding, and at the same time, the CCD camera takes pictures and monitors the weld formation, so as to realize accurate positioning of the welding points and ensure extremely high welding quality; workpiece identification codes are set on each workpiece of the inverter busbar, and fixture identification codes corresponding to the workpiece identification codes are also set on the first welding fixture and the second welding fixture. The scanning device matches each workpiece of the inverter busbar with the first welding fixture and the second welding fixture respectively through the workpiece identification codes and the fixture identification codes, which ensures that the matching of each workpiece and fixture is correct. Through the one-to-one matching method, it is ensured that there will be no problem of incorrect welding positions between workpieces, and the accuracy rate of the welding operation is ensured; the setting of the first station and the second station can effectively improve the operation efficiency of the present utility model; the setting of the laser shielding safety door separates the staff from the laser welding working area and ensures the personal safety of the staff; when welding workpieces, the code scanning device is used to ensure the matching of the workpieces and the fixtures, and then the laser rangefinder is used for laser ranging to ensure the best laser height. Through the coordinated work of the 2D galvanometer system and the CCD camera, the correspondence between the welding workpiece and the welding fixture and the uniqueness of the welding position are ensured, and the problem of incorrect welding positions is avoided.

[0018] Furthermore, the automatic welding system further includes a bottom plate, and the welding room, the laser, and the chiller are all arranged on the bottom plate. Thus, all the devices and components are arranged on the same bottom plate, enabling the system of the present utility model to be transported as a whole, which facilitates transportation; at the same time, the same bottom plate also ensures the accuracy of system coordination and the accuracy of operation.

[0019] On the workbench and at positions close to each welding point of the product, protection gas spray points are arranged, and the protection gas is nitrogen. Thus, by introducing the protection gas into the welding points, the welds after welding are prevented from being oxidized at high temperatures, thereby improving the aesthetic effect of the weld surface.

[0020] The scanning device is a barcode scanner. The laser is a multimode laser with the model number YLS-5000 / 3000-AMB. The maximum power for welding the inner ring of the workpiece is 5KW, and the maximum power for welding the outer ring is 3KW. Specifically, the power for laser welding the inner ring of the workpiece is 4KW, and the power for welding the outer ring is 2KW. Thus, different powers are used for welding the inner and outer rings of the workpiece, ensuring high-quality welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the simple structure of the system of the present utility model;

[0022] Figure 2 is a schematic diagram of the simple structure of the workbench;

[0023] Figure 3 is a schematic diagram of the simple structure of the state of the workbench after the laser shielding safety door drops;

[0024] Figure 4 is a schematic diagram of the simple structure of the welding fixture;

[0025] Figure 5 is a schematic block diagram of the simple structure of the communication part of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] As Figures 1 to 5 shown, the inverter busbar in the present utility model is composed of a magnetic ring, a first busbar, a second busbar, a third busbar, and a fourth busbar. The first busbar and the second busbar are first inserted into the magnetic ring. The first busbar and the third busbar are connected by welding, and the second busbar and the fourth busbar are connected by welding. The automatic welding system includes

[0027] a welding room 1 for isolating the laser welding working area;

[0028] a laser 2 for providing laser welding work;

[0029] a chiller 3 for cooling the laser 2;

[0030] an industrial control computer 4 disposed on the welding room 1 for controlling the welding work. In this embodiment, the industrial control computer is a PLC controller;

[0031] and a laser welding head 5;

[0032] The laser welding head 5 is connected to the laser 2. A workbench 6 is arranged in the welding chamber 1. A first station 7 and a second station 8 are arranged on the workbench 6. A first welding fixture 9 and a second welding fixture 10 are respectively arranged on the first station 7 and the second station 8. A scanning device is connected to the industrial control computer 4. A workpiece identification code is arranged on each workpiece of the inverter busbar. Fixture identification codes corresponding to the workpiece identification codes are also arranged on the first welding fixture 9 and the second welding fixture 10. The scanning device matches each workpiece of the inverter busbar with the first welding fixture 9 and the second welding fixture 10 respectively through the workpiece identification code and the fixture identification code;

[0033] An XYZ-axis moving mechanism is further arranged on the workbench 6. The laser welding head 5 is arranged on the XYZ-axis moving mechanism.

[0034] A 2D galvanometer system, a CCD camera and a laser rangefinder are simultaneously arranged on the XYZ-axis moving mechanism;

[0035] The laser 2, the chiller 3, the laser welding head 5, the XYZ-axis moving mechanism, the 2D galvanometer system, the CCD camera and the laser rangefinder are all electrically connected to the industrial control computer 4. The industrial control computer 4 is electrically connected to a background control system arranged peripherally;

[0036] A laser shielding safety door 12 is arranged at the front end of the workbench 6.

[0037] The automatic welding system further includes a bottom plate 11. The welding chamber 1, the laser 2 and the chiller 3 are all arranged on the bottom plate 11. Protection gas spray points are arranged on the workbench 6 at positions close to each welding point of the product. The protection gas is nitrogen. The scanning device is a barcode scanner. The laser 2 uses a multimode laser with the model YLS-5000 / 3000-AMB. The maximum power of the inner ring of the welded workpiece is 5KW, and the maximum power of the outer ring is 3KW. Specifically, the power of the inner ring of the laser welded workpiece is 4KW, and the power of the outer ring is 2KW.

[0038] Performing laser welding by using the above-mentioned laser automatic welding system for inverter busbars includes the following steps:

[0039] a. Power on the system, load the workpiece at the first station. The scanning device scans and matches each workpiece and the fixture for the workpiece to be placed, and respectively place the magnetic ring, the first busbar, the second busbar, the third busbar and the fourth busbar in the inverter busbar on the welding fixture. The corresponding welding fixture clamps the workpiece, and press the start button;

[0040] b. The corresponding workstation slides into the laser welding area, the laser blocking safety door falls, and the laser welding head moves into place;

[0041] c. The laser rangefinder measures the distance of the first welding point, the 2D galvanometer system scans the weld, and the laser welding head 5 welds the welding point;

[0042] d. After the first welding spot is welded, the industrial computer obtains the image of the weld through the CCD camera, and sends the obtained weld image to the background control system for analysis and storage;

[0043] e. Repeat steps c and d until all welding points are welded;

[0044] f. The laser blocking safety door rises, the workstation withdraws from the welding area, the welding fixture releases the workpiece, and the material is manually dropped to complete the welding of the first workstation;

[0045] g. Transfer the workpiece that has completed welding work at the first station to the second station, repeat steps a to f, complete the welding work at the second station, and finally blank.

[0046] In this embodiment, in order to control welding spatter, a keyhole-stabilized and molten pool-stabilized AMB laser is used. The annular beam minimizes the kinetic energy of the escaping vapor, and the annular spot softens and deflects the material toward the root of the molten pool to reduce spatter. The workpiece is 3mm butt-jointed with a 1mm plate thickness. The optical fiber core diameter is 50μm in the center and 150μm in the outer ring. The inner ring is welded with a laser power of 4kw and the outer ring with a laser power of 2kw. A 2D galvanometer with a collimation of 140mm and a focal length of 415mm is used for welding, and the welding speed is 200mm / s. The detection distance of the laser rangefinder: the range is 400mm, and the range is 400+-200mm (the distance sensor is 200-600mm is the measurable range).

[0047] The chiller is Tongfei Company's TFLW-8000WDR-05Z3-3385 ​​chiller. The welding area is clamped with clamps and clamping blocks to expose the welding area to prevent laser welding splashes from damaging the magnetic ring. The system is equipped with a Siemens PLC electrical control system, using profinet bus communication. The PLC coordinates the timing actions of the laser and welding head motion structure and other equipment, and ensures the safety of personnel and equipment through the interlocking of safety signals. The industrial computer is a touch-screen industrial control all-in-one computer that can display the welding status, welding parameters, common faults, alarm information, and common fault alarm information release methods in real time. The touch-screen industrial control all-in-one computer is embedded in the welding room. Figure 5As shown in the figure. The overall welding room is composed of sheet metal parts and steel frames, meeting the requirements of laser welding. At the same time, a dust collector pipe opening is reserved for convenient installation of a dust collector in the later stage. The welding room is integrally connected to the large bottom plate, and the large bottom plate and the laser room are carried as a whole during equipment relocation. The laser shielding safety door is installed on the top of the house and can be automatically lifted and lowered. When the sliding table slides, the shielding rises to avoid interference with the fixture structure and at the same time shield the laser.

[0048] After the welding of the first station sub-assembly is completed, the sliding table slides out. After manual blanking is completed, the welded workpiece can be directly placed on the second station. After the second station is loaded, press the start button and the sliding table of the second station slides into the second side welding station.

[0049] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An inverter busbar laser automatic welding system, wherein the inverter busbar is composed of a magnetic ring, a first busbar, a second busbar, a third busbar and a fourth busbar, the first busbar and the second busbar are first inserted into the magnetic ring, the first busbar and the third busbar are connected by welding, and the second busbar and the fourth busbar are connected by welding, characterized in that: The automatic welding system includes A welding room (1) for isolating the laser welding work area; A laser (2) for providing laser welding work; A water chiller (3) for cooling the laser (2); An industrial computer (4) disposed in the welding room (1) and used to control welding work; and a laser welding head (5); The laser welding head (5) is connected to the laser (2); a workbench (6) is provided in the welding room (1); a first workstation (7) and a second workstation (8) are provided on the workbench (6); a first welding fixture (9) and a second welding fixture (10) are provided on the first workstation (7) and the second workstation (8), respectively; a scanning device is connected to the industrial computer (4); a workpiece identification code is provided on each workpiece of the inverter busbar; a fixture identification code corresponding to the workpiece identification code is also provided on the first welding fixture (9) and the second welding fixture (10); the scanning device matches each workpiece of the inverter busbar with the first welding fixture (9) and the second welding fixture (10) through the workpiece identification code and the fixture identification code; The workbench (6) is also provided with an XYZ axis moving mechanism, and the laser welding head (5) is arranged on the XYZ axis moving mechanism. The XYZ axis moving mechanism is provided with a 2D galvanometer system, a CCD camera and a laser rangefinder; The laser (2), the chiller (3), the laser welding head (5), the XYZ axis moving mechanism, the 2D galvanometer system, the CCD camera and the laser rangefinder are all electrically connected to the industrial control computer (4), and the industrial control computer (4) is electrically connected to a peripheral background control system; a laser blocking safety door (12) is provided at the front end of the workbench (6).

2. The inverter busbar automatic laser welding system according to claim 1 is characterized in that: The automatic welding system further comprises a base plate (11), and the welding room (1), the laser (2), and the chiller (3) are all arranged on the base plate (11).

3. The inverter busbar automatic laser welding system according to claim 1 is characterized in that: A protective gas spray point is arranged on the workbench (6) and close to each welding point of the product, wherein the protective gas is nitrogen.

4. The inverter busbar automatic laser welding system according to claim 1 is characterized in that: The scanning device is a barcode scanning gun, and the laser (2) is a multi-mode laser of model YLS-5000 / 3000-AMB, with a maximum power of 5KW for welding the inner ring of the workpiece and a maximum power of 3KW for welding the outer ring.

5. The inverter busbar automatic laser welding system according to claim 4 is characterized in that: The power of laser welding the inner ring of the workpiece is 4KW, and the power of laser welding the outer ring is 2KW.

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