A device and method suitable for laser welding of annular welds

Abstract

The present invention discloses a device and method suitable for laser welding of annular welds, comprising a laser welding head and a welding box, wherein the laser welding head is connected to a laser through an optical fiber, the laser welding head is arranged outside the welding box, the outer surface of the welding box is provided with a light-transmitting lens, and further comprises a workpiece rotating assembly and a lifting assembly; the welding box is provided with a docking port movably connected to the workpiece rotating assembly, and the welding box is connected to an atmosphere cabinet; the workpiece rotating assembly and the lifting assembly are both arranged outside the welding box, the lifting assembly is connected to the workpiece rotating assembly or the welding box, the lifting assembly is used for the fitting or separation of the workpiece rotating assembly and the docking port, and the workpiece rotating assembly is provided with a workpiece clamping device. The device structure has good convenience for the welding clamping process, further improves the welding efficiency, and has a simple structure and is easy to maintain.

Description

Technical Field

[0001] The invention relates to the field of laser welding, and in particular to a device and method suitable for laser welding of annular welds. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. The welding process is a heat conduction type, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully applied in modern industry. The volume of the vacuum chamber of the existing vacuum laser welding device is relatively large, and it takes a long time to evacuate the vacuum before welding, resulting in low welding efficiency. The Chinese utility model patent with application number 201920016636.3 places the laser welding head outside the closed cavity, but the welding function is single and cannot be used for annular welds. Among them, the Chinese invention patent with application number 201310149610.3 discloses a device for vacuum laser welding, but the device has the following defects:

[0003] 1. The device can only perform laser welding on the end face annular weld of the workpiece to be welded, and has limitations on the welding surface position of the workpiece to be welded;

[0004] 2. The sealing of the vacuum chamber requires the cooperation of the side of the workpiece to be welded, which places high requirements on the side shape and smoothness of the welded part;

[0005] 3. During the welding process, the vacuum chamber needs to rotate together with the workpiece to be welded, and the mechanism is complicated;

[0006] 4. When assembling the workpiece to be welded and the vacuum chamber, it is necessary to add the vacuum chamber locking operation, which is a cumbersome procedure.

[0007] In summary, the existing welding devices still have many shortcomings and deficiencies in the application process and need to be further improved to meet the development needs of modern industry. Summary of the invention

[0008] In order to overcome the shortcomings of the prior art, the present invention provides a device and method suitable for annular weld laser welding.

[0009] The present invention discloses a device suitable for annular weld laser welding, comprising a laser welding head and a welding box, wherein the laser welding head is connected to a laser through an optical fiber, the laser welding head is arranged outside the welding box, a light-transmitting lens is arranged on the outer surface of the welding box, and further comprising a workpiece rotating assembly and a lifting assembly;

[0010] The welding box is provided with a docking port movably connected to the workpiece rotating assembly.

[0011] The welding box is connected to the atmosphere cabinet;

[0012] The workpiece rotating assembly and lifting assembly are both arranged outside the welding box.

[0013] The lifting assembly is connected to the workpiece rotating assembly or the welding box. The lifting assembly is used for fitting or separating the workpiece rotating assembly and the docking port. The workpiece rotating assembly is provided with a workpiece clamping device.

[0014] Furthermore, the outer surface of the welding box includes an upper end surface and / or a side surface, and the side surface of the welding box is provided with an observation window.

[0015] Furthermore, the welding box is any one of a rectangular body, a cylinder, and a cone.

[0016] Furthermore, the light-transmitting lens is made of quartz glass with a light transmittance of more than 95%.

[0017] Furthermore, the laser welding head is connected to a laser welding head driving assembly, and the laser welding head driving assembly includes a Z-axis linear module, a Y-axis linear module, and an A-axis rotation module.

[0018] Furthermore, a vacuum pressure gauge and / or an oxygen content tester is provided in the welding box, and the vacuum pressure gauge and the oxygen content tester are communicatively connected with the atmosphere cabinet, and a vacuum generating device and / or a protective gas replacement device is provided in the atmosphere cabinet.

[0019] Furthermore, the lifting assembly is connected to the workpiece rotating assembly, and a sealing structure is provided at the edge of the docking port.

[0020] Furthermore, the workpiece rotating assembly includes an outer sleeve, a rotating shaft, an angular contact ball bearing, a bearing clamping end cover, a servo motor, and a mounting seat. The workpiece clamping device is arranged at the upper end of the rotating shaft. The rotating shaft is installed on the outer sleeve through an angular contact ball bearing and a bearing clamping end cover. The outer sleeve is installed on the mounting seat. The lower end of the rotating shaft is connected to the servo motor.

[0021] Furthermore, the lifting assembly includes a lifting drive, a fixed plate, and a connecting piece. The fixed plate is provided with a slideway. One end of the connecting piece is movably connected to the slideway, and the other end is connected to the mounting seat. The lifting drive drives the connecting piece to move along the slideway.

[0022] More specifically, the sealing structure includes a sealing groove and a sealing ring, wherein the sealing ring is arranged in the sealing groove, and the sealing groove is arranged at the upper end of the outer sleeve or at the edge of the docking port.

[0023] Furthermore, it also includes an oil seal assembly, which is arranged on the workpiece rotating assembly, and the oil seal assembly includes a high-pressure air chamber, a pressurizing device and a pair of rotary sealing rings, the pair of rotary sealing rings are installed on the rotating shaft, the pair of rotary sealing rings are connected to the high-pressure air chamber, the high-pressure air chamber is provided with sealing oil, and the upper part of the high-pressure air chamber is connected to the pressurizing device.

[0024] Furthermore, the upper portion of the high-pressure gas chamber is connected to a vacuum generating device.

[0025] Furthermore, it also includes a control component, which includes a PLC controller, and the PLC controller is connected to the laser, the laser welding head drive component, the atmosphere cabinet, the lifting component, and the servo motor.

[0026] The method for annular weld laser welding adopted by the device comprises the following steps:

[0027] S1. The lifting assembly drives the welding box to separate from the workpiece rotating assembly, fixes the workpiece to be welded to the workpiece clamping device, drives the welding box to fit with the workpiece rotating assembly, and the atmosphere cabinet adjusts the atmosphere in the welding box to the welding standard;

[0028] S2, the workpiece rotating assembly drives the workpiece to be welded to rotate, and the laser welding head emits laser light, which is transmitted to the welding part of the workpiece to be welded through the light-transmitting lens;

[0029] S3. After welding is completed, the atmosphere cabinet adjusts the atmosphere environment in the welding box to the standard that the welding box and the workpiece rotating assembly can be separated, and the lifting assembly drives the welding box and the workpiece rotating assembly to separate and remove the welding workpiece.

[0030] Furthermore, in step S2, the welding part includes the upper end surface and the side surface of the workpiece to be welded.

[0031] The main advantages of the device and method for annular weld laser welding of the present invention are:

[0032] 1. Installing light-transmitting lenses on the top and sides of the welding box can realize the welding of the end weld and side weld of the workpiece to be welded in an atmospheric environment;

[0033] 2. A sealing ring is designed on the lower surface of the welding box. When the workpiece rotating assembly rises and docks with the atmosphere welding box assembly, a sealed cavity can be formed inside the welding box, replacing the traditional open and close sealing door;

[0034] 3. A sealing structure is designed between the outer jacket and the rotating shaft of the workpiece rotating assembly to ensure that the workpiece to be welded rotates inside the welding box while playing a sealing role, ensuring the atmosphere standard in the welding box and improving the welding quality;

[0035] 4. The device structure extends the rotating shaft outside the welding box, ensuring that the installation position of the servo motor is not inside the welding box, reducing the volume of the welding box, shortening the time for the atmosphere cabinet to adjust the atmosphere in the welding box to the welding standard, and improving the welding efficiency;

[0036] 5. The device structure is convenient for the welding clamping process, further improving the welding efficiency. At the same time, the structure is simple and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of a device suitable for laser welding of annular welds;

[0038] Figure 2 It is a schematic diagram of the workpiece to be welded and the weld position;

[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of the welding box;

[0040] Figure 4 It is a cross-sectional view of the cross-sectional structure of the workpiece rotating component.

[0041] Among them, 1 laser welding head drive assembly; 1-1 Z axis linear module; 1-2 Y axis linear module; 1-3 A axis rotation module; 1-4 laser welding head; 2 welding box; 2-1 light-transmitting lens; 2-2 exhaust hole; 2-3 air supply hole; 2-4 sealing ring; 2-5 docking port; 2-6 observation window; 2-7 vacuum pressure gauge; 2-8 oxygen content tester; 3 workpiece to be welded; 3-1 end face weld; 3-2 workpiece A to be welded; 3-3 side weld; 3-4 workpiece B to be welded; 4 oil seal assembly; 4-1 high-pressure gas chamber; 4-2 sealing oil; 5 workpiece rotating assembly; 5-1 workpiece clamping device; 5-2 outer sleeve; 5-3 rotating shaft; 5-4 angular contact ball bearing; 5-5 rotary sealing ring; 5-6 bearing clamping end cover; 5-7 high-pressure sealing chamber; 6 servo motor; 7 lifting assembly; 8 mounting seat; 9 optical fiber; 10 laser; 11 connecting air pipe; 12 atmosphere cabinet; 13 control cable; 14 PLC. DETAILED DESCRIPTION

[0042] 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.

[0043] Example 1

[0044] A device suitable for annular weld laser welding, comprising a laser welding head and a welding box, wherein the laser welding head is connected to a laser through an optical fiber, the laser welding head is arranged outside the welding box, the outer surface of the welding box is provided with a light-transmitting lens, and further comprising a workpiece rotating assembly and a lifting assembly;

[0045] The welding box is provided with a docking port movably connected to the workpiece rotating assembly.

[0046] The welding box is connected to the atmosphere cabinet;

[0047] The workpiece rotating assembly and lifting assembly are both arranged outside the welding box.

[0048] The lifting assembly is connected to the workpiece rotating assembly or the welding box. The lifting assembly is used for fitting or separating the workpiece rotating assembly and the docking port. The workpiece rotating assembly is provided with a workpiece clamping device.

[0049] The outer surface of the welding box includes an upper end surface and a side surface. The side surface of the welding box is provided with an observation window, through which the internal welding conditions can be observed with naked eyes. A laser protective film is attached to the observation window.

[0050] In this embodiment, the welding box is a rectangular body, which can adapt to the annular weld welding of workpieces with various shapes; the light-transmitting lens is quartz glass with a light transmittance of more than 95%.

[0051] The workpiece rotating assembly includes an outer sleeve, a rotating shaft, an angular contact ball bearing, a bearing clamping end cover, a servo motor, and a mounting seat. The workpiece clamping device is arranged at the upper end of the rotating shaft. The rotating shaft is installed on the outer sleeve through the angular contact ball bearing and the bearing clamping end cover. The outer sleeve is installed on the mounting seat. The lower end of the rotating shaft is connected to the servo motor.

[0052] The device is completed by welding through the following steps:

[0053] S1. The lifting assembly drives the welding box to separate from the workpiece rotating assembly, and fixes the workpiece to be welded to the workpiece clamping device. The workpiece clamping device is a mechanical three-jaw chuck, which can automatically center and clamp conveniently and quickly. The lifting assembly drives the welding box to fit the workpiece rotating assembly, and the atmosphere cabinet adjusts the atmosphere in the welding box to the welding standard; the lifting assembly can drive the welding box or the workpiece rotating assembly to separate the welding box from the workpiece rotating assembly. In this embodiment, the lifting assembly drives the workpiece rotating assembly to separate the welding box from the workpiece rotating assembly. The lifting assembly includes a lifting drive, a fixed plate, and a connecting member. A slide is provided on the fixed plate. One end of the connecting member is movably connected to the slide, and the other end is connected to the mounting seat. The lifting drive drives the connecting member to move along the slide. The lifting driver is any one of an air cylinder, an oil cylinder or a driving motor assembly, the driving motor assembly includes a driving motor and a transmission assembly, and the transmission assembly is a screw structure or a gear rack structure; a vacuum pressure gauge is provided in the welding box, the vacuum pressure gauge is connected to the atmosphere cabinet for communication, a vacuum generating device is provided in the atmosphere cabinet, an air extraction hole and an air supply hole are provided on the welding box, the vacuum generating device is connected to the air extraction hole and the air supply hole, and the vacuum generating device evacuates the environment in the welding box to the welding standard through the air extraction hole;

[0054] S2, the workpiece rotating assembly drives the workpiece to be welded to rotate, and the laser welding head emits laser light, which is transmitted to the welding part of the workpiece to be welded through the light-transmitting lens, wherein the rotation speed of the workpiece to be welded can be adjusted by the servo motor, and thus is applicable to a variety of different workpieces to be welded;

[0055] S3. After welding is completed, the atmosphere cabinet adjusts the atmosphere in the welding box to the standard that the welding box and the workpiece rotating assembly can be separated. The vacuum generating device sends air into the welding box through the air supply hole to break the vacuum negative pressure state. The lifting assembly drives the welding box to separate from the workpiece rotating assembly, removes the welding workpiece, and facilitates the separation of the welding box and the workpiece rotating assembly. Compared with other welding devices, the steps of completing welding in the device of the present invention are simpler, and the welding efficiency and welding quality are significantly improved.

[0056] The laser welding head is connected to the laser welding head driving assembly, and the laser welding head driving assembly includes a Z-axis linear module, a Y-axis linear module, and an A-axis rotation module. The workpiece to be welded consists of a workpiece A to be welded and a workpiece B to be welded. The laser welding head first welds the end face weld of the upper end face of the workpiece to be welded, and then the Z-axis linear module and the Y-axis linear module move the laser welding head to the position of the light-transmitting lens on the side of the welding box, and the A-axis rotation module rotates the laser welding head to be perpendicular to the light-transmitting lens on the side, and then welds the side weld of the workpiece to be welded.

[0057] Example 2

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a device suitable for annular weld laser welding includes a laser welding head and a welding box, wherein the laser welding head is connected to a laser through an optical fiber, the laser welding head is arranged outside the welding box, and a light-transmitting lens is arranged on the outer surface of the welding box, and further includes a workpiece rotating assembly and a lifting assembly;

[0059] The welding box is provided with a docking port movably connected to the workpiece rotating assembly.

[0060] The welding box is connected to the atmosphere cabinet;

[0061] The workpiece rotating assembly and lifting assembly are both arranged outside the welding box.

[0062] The lifting assembly is connected to the workpiece rotating assembly or the welding box. The lifting assembly is used for fitting or separating the workpiece rotating assembly and the docking port. The workpiece rotating assembly is provided with a workpiece clamping device.

[0063] The outer surface of the welding box includes an upper end surface and a side surface, and an observation window is arranged on the side surface of the welding box.

[0064] In this embodiment, the welding box is a cylinder, wherein the shape of the workpiece to be welded is also a cylinder. The welding box and the workpiece to be welded have the same shape, which is beneficial to reducing the volume of the welding box that is vacuumed or filled with inert gas, further improving welding efficiency and reducing energy consumption.

[0065] The light-transmitting lens is made of quartz glass with a light transmittance of more than 95%.

[0066] The laser welding head is connected to a laser welding head driving assembly, and the laser welding head driving assembly includes a Z-axis linear module, a Y-axis linear module, and an A-axis rotation module.

[0067] The welding box is provided with a vacuum pressure gauge and an oxygen content tester, and the vacuum pressure gauge and the oxygen content tester are communicatively connected with the atmosphere cabinet. The atmosphere cabinet is provided with a vacuum generating device and a protective gas replacement device, and the protective gas replacement device can replace inert gas (argon or helium) and carbon dioxide into the welding box. When in use, it can be suitable for vacuum environment welding or inert gas environment welding. Either the vacuum generating device or the protective gas replacement device can be selected according to the welding scenario, so that the atmosphere environment in the welding box meets the use standard.

[0068] The lifting assembly is connected to the workpiece rotating assembly, and a sealing structure is provided at the edge of the docking interface. The sealing structure includes a sealing groove and a sealing ring, the sealing ring is arranged in the sealing groove, and the sealing groove is arranged at the edge of the docking interface.

[0069] The workpiece rotating assembly includes a sleeve, a rotating shaft, an angular contact ball bearing, a bearing clamping end cover, a servo motor, and a mounting seat. The workpiece clamping device is arranged at the upper end of the rotating shaft. The rotating shaft is mounted on the sleeve through the angular contact ball bearing and the bearing clamping end cover. The sleeve is mounted on the mounting seat. The lower end of the rotating shaft is connected to the servo motor. Figure 4 As shown, the angular contact ball bearings are a pair and are installed near both ends of the rotating shaft, which provides better stability during the rotation of the rotating shaft.

[0070] The lifting assembly includes a lifting drive, a fixed plate, and a connecting piece (not shown in the figure). The fixed plate is provided with a slideway, one end of the connecting piece is movably connected to the slideway, and the other end is connected to the mounting seat. The lifting drive drives the connecting piece to move up and down along the slideway, wherein the stroke of the up and down movement can be controlled by setting two travel switches on one side of the fixed plate. By adjusting the positions of the two travel switches, the separation distance of the welding box and the workpiece rotating assembly can be controlled, and the distance is based on the height that can facilitate the loading and unloading of the workpieces to be welded.

[0071] In this embodiment, an oil seal assembly is also included. The oil seal assembly is arranged on the workpiece rotating assembly. The oil seal assembly includes a high-pressure air chamber, a pressurizing device and a pair of rotary sealing rings. The pair of rotary sealing rings are installed on the rotating shaft. The pair of rotary sealing rings are connected to the high-pressure air chamber. The high-pressure air chamber is provided with sealing oil. The upper part of the high-pressure air chamber is connected to the pressurizing device. Before welding the workpiece to be welded, the pressurizing device pressurizes the high-pressure air chamber. After being sealed by the oil seal assembly, during the rotation of the rotating shaft, the air outside the welding box will not enter the welding box, thereby making the welding quality higher than that of conventional welding devices.

[0072] It also includes a control component, which includes a PLC controller. The PLC controller is connected to a laser, a laser welding head drive component, an atmosphere cabinet, a lifting component, and a servo motor through a control cable.

[0073] Through the PLC controller, all actions of the welding process of the device can be completed automatically in a time sequence, which is convenient for matching with an automated production line. The workpiece clamping device is a hydraulic, pneumatic or electric chuck, and the clamping process of the workpiece to be welded can be completed by an automated manipulator. Compared with traditional laser welding devices, the solution of the present invention has better convenience for the welding clamping process and improves the welding efficiency. Its reasonable and simple structure makes the welding process more efficient and quick, and the device structure is easy to maintain. At the same time, the workpiece to be welded can obtain a high-quality welding effect under the protection of vacuum or inert gas.

[0074] Example 3

[0075] A device suitable for annular weld laser welding, comprising a laser welding head and a welding box, wherein the laser welding head is connected to a laser through an optical fiber, the laser welding head is arranged outside the welding box, the outer surface of the welding box is provided with a light-transmitting lens, and further comprising a workpiece rotating assembly and a lifting assembly;

[0076] The welding box is provided with a docking port movably connected to the workpiece rotating assembly.

[0077] The welding box is connected to the atmosphere cabinet;

[0078] The workpiece rotating assembly and lifting assembly are both arranged outside the welding box.

[0079] The lifting assembly is connected to the workpiece rotating assembly or the welding box. The lifting assembly is used for fitting or separating the workpiece rotating assembly and the docking port. The workpiece rotating assembly is provided with a workpiece clamping device.

[0080] The outer surface of the welding box includes an upper end surface and a side surface, and an observation window is arranged on the side surface of the welding box.

[0081] In this embodiment, the welding box is a cone, and the welding box fits the shape of the workpiece to be welded, which is beneficial to reducing the volume of vacuum or inert gas filling and improving welding efficiency.

[0082] The laser welding head is connected to a laser welding head driving assembly, and the laser welding head driving assembly includes a Z-axis linear module, a Y-axis linear module, and an A-axis rotation module.

[0083] The welding box is provided with a vacuum pressure gauge and an oxygen content tester, and the vacuum pressure gauge and the oxygen content tester are communicatively connected with the atmosphere cabinet. The atmosphere cabinet is provided with a vacuum generating device and a protective gas replacement device. When the workpiece to be welded requires a vacuum welding environment, the welding box is evacuated, and the vacuum pressure gauge is used to monitor whether the vacuum environment meets the welding requirements; when the workpiece to be welded requires a welding environment of protective gas, the air in the welding box is replaced by the protective gas replacement device, and the oxygen content in the welding box is monitored by the oxygen content tester to see whether it meets the welding requirements. The vacuum and protective gas environments can adapt to welding scenarios of different workpieces to be welded.

[0084] The lifting assembly is connected to the workpiece rotating assembly, and a sealing structure is provided at the edge of the docking port.

[0085] The workpiece rotating assembly includes an outer sleeve, a rotating shaft, an angular contact ball bearing, a bearing clamping end cover, a servo motor, and a mounting seat. The workpiece clamping device is arranged at the upper end of the rotating shaft. The rotating shaft is installed on the outer sleeve through the angular contact ball bearing and the bearing clamping end cover. The outer sleeve is installed on the mounting seat. The lower end of the rotating shaft is connected to the servo motor.

[0086] The lifting assembly includes a lifting drive, a fixing plate, and a connecting piece. The fixing plate is provided with a slideway. One end of the connecting piece is movably connected to the slideway, and the other end is connected to the mounting seat. The lifting drive drives the connecting piece to move along the slideway.

[0087] The sealing structure comprises a sealing groove and a sealing ring, wherein the sealing ring is arranged in the sealing groove, and the sealing groove is arranged at the upper end of the outer sleeve.

[0088] It also includes an oil seal assembly, which is arranged on the workpiece rotating assembly. The oil seal assembly includes a high-pressure air chamber and a pair of rotary sealing rings. The rotary sealing rings are lip-shaped sealing rings. The pair of rotary sealing rings are installed on the rotating shaft. The pair of rotary sealing rings are connected to the high-pressure air chamber. Sealing oil is arranged in the high-pressure air chamber.

[0089] The upper part of the high-pressure air chamber is connected to the vacuum generating device, and part of the air extracted by the welding box during vacuuming can be directly pressurized into the high-pressure sealing cavity. The sealing oil in the high-pressure sealing cavity presses the rotary sealing ring, so that the rotary sealing ring is tightly attached to the outer surface of the rotating shaft, and the sealing oil does not leak to the two ends of a pair of rotary sealing rings, thereby achieving a sealing effect between the internal cavity of the welding box and the external atmospheric pressure.

Claims

1. A device suitable for laser welding of annular welds, comprising a laser welding head and a welding box, wherein the laser welding head is connected to a laser via an optical fiber, and is characterized in that The laser welding head is arranged outside the welding box, the outer surface of which is provided with a light-transmitting lens, and also includes a workpiece rotating assembly and a lifting assembly; The welding box is provided with a docking port movably connected to the workpiece rotating assembly. The welding box is connected to the atmosphere cabinet; The workpiece rotating assembly and lifting assembly are both arranged outside the welding box. The lifting assembly is connected to the workpiece rotating assembly or the welding box, and the lifting assembly is used for fitting or separating the workpiece rotating assembly and the docking port, and the workpiece rotating assembly is provided with a workpiece clamping device; The laser welding head is connected to a laser welding head driving assembly, and the laser welding head driving assembly includes a Z-axis linear module, a Y-axis linear module, and an A-axis rotation module; The welding box is provided with a vacuum pressure gauge and / or an oxygen content tester, the vacuum pressure gauge and the oxygen content tester are communicatively connected with the atmosphere cabinet, and the atmosphere cabinet is provided with a vacuum generating device and / or a protective gas replacement device; The workpiece rotating assembly includes a sleeve, a rotating shaft, an angular contact ball bearing, a bearing clamping end cover, a servo motor, and a mounting seat. The workpiece clamping device is arranged at the upper end of the rotating shaft. The rotating shaft is mounted on the sleeve through the angular contact ball bearing and the bearing clamping end cover. The sleeve is mounted on the mounting seat. The lower end of the rotating shaft is connected to the servo motor. It also includes an oil seal assembly, which is arranged on the workpiece rotating assembly. The oil seal assembly includes a high-pressure air chamber, a pressurizing device and a pair of rotary sealing rings. The pair of rotary sealing rings are installed on the rotating shaft. The pair of rotary sealing rings are connected to the high-pressure air chamber. Sealing oil is arranged in the high-pressure air chamber. The upper part of the high-pressure air chamber is connected to the pressurizing device.

2. The device for circular seam laser welding according to claim 1, characterized in that: The outer surface of the welding box includes an upper end surface and / or a side surface, and an observation window is provided on the side surface of the welding box.

3. The device for circular seam laser welding according to claim 1, characterized in that The lifting assembly is connected to the workpiece rotating assembly, and a sealing structure is provided at the edge of the docking port.

4. The device for laser welding of annular welds according to claim 1, characterized in that It also includes a control component, which includes a PLC controller. The PLC controller is connected to a laser, a laser welding head drive component, an atmosphere cabinet, a lifting component, and a servo motor.

5. A method for laser welding of annular welds according to any one of claims 1 to 4, characterized in that The following steps are involved: S1. The lifting assembly drives the welding box to separate from the workpiece rotating assembly, fixes the workpiece to be welded to the workpiece clamping device, drives the welding box to fit with the workpiece rotating assembly, and the atmosphere cabinet adjusts the atmosphere in the welding box to the welding standard; S2, the workpiece rotating assembly drives the workpiece to be welded to rotate, and the laser welding head emits laser light, which is transmitted to the welding part of the workpiece to be welded through the light-transmitting lens; S3. After welding is completed, the atmosphere cabinet adjusts the atmosphere environment in the welding box to the standard that the welding box and the workpiece rotating assembly can be separated, and the lifting assembly drives the welding box and the workpiece rotating assembly to separate and remove the welding workpiece.

6. The method for laser welding of annular welds according to claim 5, characterized in that In step S2, the welding part includes the upper end surface and the side surface of the workpiece to be welded.

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