Four-axis laser welding device

Abstract

The utility model relates to a four-axis laser welding device which comprises a four-axis driving device. The laser welding device is arranged on the four-axis driving device; the first displacement device is arranged at one end of the four-axis driving device and is used for fixing and rotating the first shell and the second shell; the third displacement device is arranged at the other end of the four-axis driving device and used for fixing and rotating the compressor shell. The connecting and fixing device is arranged on the third displacement device and used for fixing the connecting base to the compressor shell and rotating along with the compressor shell. The second displacement device is arranged between the first displacement device and the third fixing device and used for fixing and rotating the compressor shell and the second connecting pipe. The four-axis driving device is used for driving the laser welding device to conduct welding. According to the device, a plurality of procedures are integrated on one piece of equipment, so that the welding efficiency is greatly improved, the welding preparation time is shortened, and the equipment cost and the labor cost are reduced.

Description

Technical Field

[0001] This utility model relates to a laser welding device, and more particularly to a four-axis laser welding device. Background Technology

[0002] like Figure 14 and Figure 15 As shown, the compressor housing includes a first housing 91, a second housing 90, a second connecting pipe 92, and a connecting base 94. Both the first housing 91 and the second housing 90 are cylindrical and need to be welded together to form the compressor housing. The second connecting pipe 92 is located on one side of the top of the second housing 90, eccentrically positioned. The connecting base 94 is welded to both the first housing 91 and the second housing 90. Currently, the welding of this compressor housing requires three independent processes. After each process is completed, the workpiece is transferred to the next process. For example, firstly, the first housing 91 and the second housing 90 are clamped on a first fixture. Then, the first housing 91 and the second housing 90 are welded together to obtain the compressor housing. Next, the compressor housing is transferred to the second process and installed on the second fixture, where the second connecting pipe 92 is welded to the second housing 90. Finally, the compressor housing with the second connecting pipe 92 welded is transferred to the third fixture in the third process, where the connecting base 94 is welded to the compressor housing to obtain the complete compressor housing. Due to the large distance between the processes, the workpiece needs to be transferred during the process transfer. Because of the numerous processes, the disassembly, clamping, and transfer times are lengthy, resulting in low overall welding efficiency. Utility Model Content

[0003] To address the aforementioned problem of low welding efficiency, this utility model provides a four-axis laser welding device, the specific technical solution of which is as follows:

[0004] A four-axis laser welding device includes: a four-axis drive device; a laser welding device mounted on the four-axis drive device; a first positioning device located at one end of the four-axis drive device for fixing and rotating a first housing and a second housing; a third positioning device located at the other end of the four-axis drive device for fixing and rotating a compressor housing; a connecting and fixing device located on the third positioning device for fixing a connecting base to the compressor housing and rotating with the compressor housing; and a second positioning device located between the first positioning device and the third fixing device for fixing and rotating the compressor housing and a second connecting pipe. The four-axis drive device drives the laser welding device to weld the first housing and the second housing on the first positioning device to form a compressor housing, weld the compressor housing and the second connecting pipe on the second positioning device together, and weld the connecting base on the third positioning device to the compressor housing.

[0005] Preferably, the four-axis drive device includes: a horizontal linear module; a vertical linear module, the vertical linear module being disposed on the horizontal slide of the horizontal linear module; a forward and backward linear module, the forward and backward linear module being disposed on the vertical slide of the vertical linear module; and a welding rotation module, the welding rotation module being disposed on the forward and backward slides of the forward and backward linear module and connected to the laser welding device.

[0006] Preferably, the first positioning device and the third positioning device have the same structure. The first positioning device includes: a positioning base plate; a positioning rotation assembly disposed at one end of the positioning base plate for fixing the second housing; a positioning clamping assembly slidably disposed at the other end of the positioning base plate; a positioning drive assembly disposed on the positioning base plate and connected to the positioning clamping assembly; and a positioning support assembly slidably disposed on the positioning base plate for supporting the first housing and the second housing.

[0007] Furthermore, the displacement rotation assembly includes: a displacement fixing seat, which is disposed at one end of the displacement base plate; a displacement spindle, which is disposed on the displacement fixing seat; and a displacement motor, which is disposed on the displacement fixing seat and connected to the displacement spindle.

[0008] Furthermore, the displacement clamping assembly includes: a displacement clamping seat, which is slidably disposed at the other end of the displacement base plate; and a displacement rotating seat, which is rotatably disposed on the displacement clamping seat and is disposed opposite to the displacement main shaft.

[0009] Furthermore, the displacement support assembly includes: a displacement support base plate, which is slidably disposed on the displacement support base plate; a displacement support cylinder, which is disposed on the displacement support base plate; and a displacement bracket, which is disposed on the displacement support cylinder and is provided with a displacement support groove.

[0010] Preferably, the connecting and fixing device includes: a connecting and fixing frame, which is mounted on the displacement and rotation assembly; a rotary clamping cylinder, which is symmetrically arranged on the connecting and fixing frame and is used to press the connecting base onto the connecting and fixing frame; a connecting positioning cylinder, which is symmetrically arranged on the connecting and fixing frame and located on one side of the rotary clamping cylinder; and a connecting positioning pin, which is mounted on the connecting positioning cylinder and is used to insert into the connecting hole of the connecting base.

[0011] Preferably, the second displacement device includes: a second base plate; a hollow rotating platform disposed on the second base plate; an eccentric disk disposed on the hollow rotating platform; a housing clamping assembly disposed on the eccentric disk for clamping the compressor housing; and a pipe clamping assembly disposed on the second base plate for fixing a second pipe to the compressor housing, wherein the second pipe is coaxially arranged with the hollow rotating platform.

[0012] Furthermore, the housing clamping assembly includes: a housing clamping sleeve disposed on the eccentric disk, and having symmetrically arranged waist-shaped tensioning grooves on both sides; a housing tensioning sleeve movably disposed within the housing clamping sleeve, and having a plurality of tensioning grooves and tensioning shafts symmetrically arranged on both sides, the tensioning shafts being movably inserted into the tensioning grooves; a tensioning rod, one end of which is rotatably disposed on the eccentric disk and has a waist-shaped tensioning drive groove, the tensioning drive groove being slidably disposed on the tensioning shaft; and a tensioning cylinder, the tensioning cylinder being rotatably disposed on the eccentric disk and rotatably connected to the other end of the tensioning rod.

[0013] Furthermore, the pipe clamping assembly includes: a pipe support, which is disposed on the second base plate; a pipe moving cylinder, which is disposed on the top of the pipe support; a cross slide, which is disposed on the pipe moving cylinder; and a pipe fixing cylinder, which is disposed on the cross slide and is used to clamp the second pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a four-axis laser welding device that integrates multiple processes into one machine, and the multiple processes are cyclically disassembled and welded, which greatly improves welding efficiency, shortens welding preparation time, and only requires one welding machine, thus reducing equipment investment costs. At the same time, only one worker is needed, thus reducing labor costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this application;

[0017] Figure 2 This is a top view of this application;

[0018] Figure 3 This is a schematic diagram of the four-axis drive unit;

[0019] Figure 4 This is a top view of the four-axis drive unit;

[0020] Figure 5 This is a schematic diagram of the structure of the first displacement device;

[0021] Figure 6 This is a front view of the first displacement device;

[0022] Figure 7 This is a schematic diagram of the displacement and rotation assembly;

[0023] Figure 8 This is a structural schematic diagram of the displacement support component;

[0024] Figure 9 This is a schematic diagram of the third displacement device;

[0025] Figure 10 This is a structural diagram of the connecting and fixing device;

[0026] Figure 11 This is a schematic diagram of the second displacement device;

[0027] Figure 12 It is an assembly drawing of the hollow rotary platform, eccentric disk, shell clamping assembly and pipe clamping assembly;

[0028] Figure 13 yes Figure 12 The front view;

[0029] Figure 14 This is a schematic diagram of the compressor housing.

[0030] Figure 15 This is a front view of the compressor housing. Detailed Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings.

[0032] like Figures 1 to 13As shown, a four-axis laser welding device 3 includes a four-axis drive device 2, a laser welding device 3, a first displacement device 4, a third displacement device 6, a connecting and fixing device 61, and a second displacement device 5. The four-axis drive unit 2 is mounted on the frame 1 and connected to the laser welding unit 3; the first positioning device 4 and the second positioning device 5 are respectively fixed at both ends of the frame 1 and are both located on the same side of the four-axis drive unit 2. The first positioning device 4 is used to fix and rotate the first housing 91 and the second housing 90; the third positioning device 6 is used to fix and rotate the compressor housing; the connecting fixing device 61 is mounted on the third positioning device 6 and is used to fix the connecting base 94 on the compressor housing and make the connecting base 94 rotate with the compressor housing; the second positioning device 5 is mounted on the frame 1 and is located between the first positioning device 4 and the third positioning device 6. The second positioning device 5 is used to fix and rotate the compressor housing and the second connecting pipe 92; the four-axis drive unit 2 is used to drive the laser welding unit 3 to weld the first housing 91 and the second housing 90 on the first positioning device 4 into a compressor housing, weld the compressor housing and the second connecting pipe 92 on the second positioning device 5 together, and weld the connecting base 94 on the third positioning device 6 onto the compressor housing.

[0033] During operation, the operator places the first housing 91 and the second housing 90 onto the first positioning device 4. The first positioning device 4 then presses the first housing 91 and the second housing 90 together and rotates them. The four-axis drive device 2 drives the laser welding device 3 to weld the first housing 91 and the second housing 90 together, forming the compressor housing. At this point, the four-axis drive device 2 moves the laser welding device 3 to the second positioning device 5, where the compressor housing is installed. The second connecting pipe 92 is also fixed to the compressor housing, and the laser welding device 3 welds the second connecting pipe 92 to the compressor housing. Finally, the four-axis drive device 2 moves the laser welding device 3 to the third positioning device 6 to weld the connecting base 94, which is pressed against the compressor housing with the welded second connecting pipe 92. When the laser welding device 3 is not welding, components can be disassembled and assembled at this station, forming a parallel process. This allows the overall process to continue in a continuous cycle without the need for transfer, greatly improving efficiency.

[0034] By integrating the three processes into the same equipment, the laser welding device 3 is switched between the three workstations by the four-axis drive device 2, which greatly reduces the number of laser welding devices 3 and lowers the equipment investment cost. Furthermore, since the three processes are on the same equipment, only one person is needed to operate it, which greatly reduces the number of operators and lowers labor costs.

[0035] The four-axis drive unit 2 includes a horizontal linear module 21, a vertical linear module 22, a forward and backward linear module 23, and a welding rotary module 24. The horizontal linear module 21 is mounted on one side of the frame 1 and is arranged along the length of the frame 1; the vertical linear module 22 is mounted on the horizontal slide of the horizontal linear module 21; the forward and backward linear module 23 is mounted on the vertical slide of the vertical linear module 22; and the welding rotary module 24 is mounted on the forward and backward slides of the forward and backward linear module 23 and is connected to the laser welding device 3. The welding rotary module 24 uses an electric rotary platform and is connected to the forward and backward slides of the forward and backward linear module 23 via a rotating bracket 25. The rotating bracket 25 positions the laser welding device 3 at the end of the forward and backward linear module 23, facilitating welding and avoiding interference with the workpiece or fixture. The horizontal linear module 21 realizes the reciprocating movement of the X-axis, the vertical linear module 22 realizes the reciprocating movement of the Z-axis, the forward and backward linear module realizes the reciprocating movement of the Y-axis, and the welding rotation module 24 realizes the rotation of the laser welding device 3 along the Y-axis. The four-axis module, together with the positioner, can complete complex curve welding.

[0036] The first positioning device 4 and the third positioning device 6 have the same structure. The first positioning device 4 includes a positioning base plate 70, a positioning rotation assembly 71, a positioning clamping assembly 72, a positioning drive assembly 73, and a positioning support assembly 41. The positioning base plate 70 is mounted on the frame 1. The positioning rotation assembly 71 is fixed to one end of the positioning base plate 70 to fix the second housing 90. The positioning clamping assembly 72 is slidably mounted on the other end of the positioning base plate 70 through a positioning linear guide pair 79 and is connected to the positioning drive assembly 73. The positioning drive assembly 73 is mounted on the positioning base plate 70 and is used to drive the positioning clamping assembly 72 to press the compressor housing onto the positioning rotation assembly 71. The positioning support assembly 41 is slidably mounted on the positioning base plate 70 through the positioning linear guide pair 79 and is located between the positioning rotation assembly 71 and the positioning clamping assembly 72 to support the first housing 91 and the second housing 90.

[0037] Specifically, the displacement rotation assembly 71 includes a displacement fixing seat 711, a displacement spindle 712, and a displacement motor 714. The displacement fixing seat 711 is installed at one end of the displacement base plate 70. The displacement spindle 712 and the displacement motor 714 are both installed on the displacement fixing seat 711. The displacement spindle 712 is also connected to the displacement motor 714. The displacement motor 714 is used to rotate the displacement spindle 712. The displacement spindle 712 is an existing spindle that can clamp the second housing 90 and drive the second housing 90 to rotate. It will not be described in detail here.

[0038] The displacement clamping assembly 72 includes a displacement clamping seat 721 and a displacement rotating seat 723. The displacement clamping seat 721 is slidably mounted on the displacement base plate 70 via a displacement linear guide pair 79 and is located at the other end of the displacement base plate 70. The displacement clamping seat 721 is connected to the displacement rotating seat 723 via a bearing seat 722. The displacement rotating seat 723 is arranged opposite to the displacement main shaft 712 and is on the same axis.

[0039] The displacement drive assembly 73 uses a pneumatic cylinder or an electric cylinder. The displacement drive assembly 73 is mounted on the displacement base plate 70. The piston rod of the displacement drive assembly 73 is connected to the displacement clamping seat 721 and is used to drive the displacement clamping seat 721 to move.

[0040] The displacement support assembly 41 includes a displacement support base plate 411, a displacement support cylinder 412, and a displacement bracket 413. The displacement support base plate 411 is mounted on the displacement linear guide pair 79. The displacement support cylinder 412 is mounted on the top of the displacement support base plate 411. The displacement support cylinder 412 is a dual-shaft cylinder. The piston rod of the displacement support cylinder 412 is connected to the displacement bracket 413. The displacement bracket 413 is provided with a displacement support groove, which is a V-shaped groove, for supporting the compressor housing.

[0041] When installing the compressor housing, the compressor housing can be placed in the displacement support slot first. At this time, the displacement support cylinder 412 is in the extended state, so that the compressor housing is coaxial with the displacement spindle 712. Then, manually push the displacement support assembly 41 so that the second housing 90 is inserted into the displacement spindle 712. The displacement spindle 712 clamps the second housing 90. Then, start the displacement drive assembly 73. The displacement drive assembly 73 drives the displacement clamping seat 721 to move towards the displacement spindle 712. The displacement rotating seat 723 presses the first housing 91 onto the second housing 90. Then, the displacement support cylinder 412 drives the displacement bracket 413 to descend, and the displacement spindle 712 drives the compressor housing to rotate.

[0042] The connecting and fixing device 61 includes a connecting fixing frame 611, a rotary clamping cylinder 612, a connecting positioning cylinder 614, and a connecting positioning pin 615. The connecting fixing frame 611 is U-shaped and is mounted on the displacement spindle 712 of the displacement rotation assembly 71, and rotates with the displacement spindle 712. The rotary clamping cylinder 612 is symmetrically fixed on both sides of the connecting fixing frame 611 and is used to press the connecting base 94 onto the connecting fixing frame 611. The connecting positioning cylinder 614 is symmetrically fixed at both ends of the connecting fixing frame 611 and is located on one side of the rotary clamping cylinder 612. The piston rod of the connecting positioning cylinder 614 is equipped with a connecting positioning pin 615, which is used to insert into the connecting hole 941 of the connecting base 94 to achieve precise positioning of the connecting base 94. First, clamp the compressor housing onto the third positioning device 6. Then, place the connecting base 94 onto the compressor housing, with both sides of the connecting base 94 resting on both sides of the connecting fixing frame 611. First, activate the connecting positioning cylinder 614 to insert the connecting hole 941 of the connecting base 94 into the connecting positioning pin 615. Then, activate the rotary clamping cylinder 612 to press the connecting base 94 onto the connecting fixing frame 611, thereby achieving the positioning of the connecting fixing frame 611.

[0043] The second positioning device 5 includes a second base plate 55, a hollow rotary platform 54, an eccentric disk 53, a housing clamping assembly 52, and a pipe clamping assembly 51. The second base plate 55 is mounted on the frame 1 and is located between the first positioning device 4 and the third positioning device 6. The hollow rotary platform 54 is an existing mature product, also known as an electric rotary platform. The hollow rotary platform 54 is mounted on top of the second base plate 55 and connected to the eccentric disk 53. The eccentric disk 53 is elliptical and achieves eccentric rotation. The housing clamping assembly 52 is mounted on the eccentric disk 53 and is used to clamp the compressor housing. The pipe clamping assembly 51 is mounted on the second base plate 55 and is used to fix the second pipe 92 to the compressor housing. The second pipe 92 is coaxially arranged with the hollow rotary platform 54. The housing clamping assembly 52 includes a housing clamping sleeve 521, a housing tensioning sleeve 522, a tensioning rod 523, and a tensioning cylinder 525. The housing clamping sleeve 521 is mounted on the eccentric disc 53. Symmetrical tensioning grooves 5211 are provided on both sides of the housing clamping sleeve 521. The tensioning grooves 5211 are oblong grooves and are arranged vertically. The housing tensioning sleeve 522 is movably inserted into the housing clamping sleeve 521. The housing tensioning sleeve 522 has several tensioning grooves 5222 and tensioning shafts 5221 symmetrically arranged on both sides. The tensioning grooves 5222 are used for the contraction and expansion of the housing tensioning sleeve 522, and the tensioning shafts 5221 are movably inserted into the tensioning grooves 5211. Tensioning pressure... The rod 523 is U-shaped. Both ends of the tensioning rod 523 are rotatably mounted on the eccentric disk 53 via connecting columns 524. Two tensioning drive grooves 5231 are symmetrically arranged at the center of the tensioning rod 523. These grooves are waist-shaped and horizontally oriented, and slide onto the tensioning shaft 5221. The tensioning cylinder 525 is a pneumatic cylinder. Its bottom is rotatably mounted on the eccentric disk 53, and the piston rod of the cylinder is rotatably connected to the other end of the tensioning rod 523. The top of the housing clamping sleeve 521 has an inner conical surface, and the outer surface of the housing tensioning sleeve 522 has an outer conical surface for tensioning. The outer and inner conical surfaces cooperate to clamp the housing tensioning sleeve 522. When the compressor housing is inserted into the housing tension sleeve 522, the piston rod of the tension cylinder 525 retracts, and the tensioning rod 523 drives the housing tension sleeve 522 to descend. The housing tension sleeve 522 clamps the compressor housing under the action of the housing clamping sleeve 521. When the tension cylinder 525 extends, the housing tension sleeve 522 releases the compressor housing. The pipe clamping assembly 51 includes a pipe bracket 514, a pipe moving cylinder 513, a cross slide 512, and a pipe fixing cylinder 511. The pipe bracket 514 is mounted on the second base plate 55 and is located on one side of the hollow rotating platform 54. The pipe moving cylinder 513 is fixed to the top of the pipe bracket 514. The pipe moving cylinder 513 is a rodless cylinder. The cross slide 512 is mounted on the slide of the rodless cylinder and is connected to the pipe fixing cylinder 511. The cross slide 512 is used to adjust the position of the pipe fixing cylinder 511. The pipe fixing cylinder 511 is a finger cylinder used to clamp the second pipe 92.

[0044] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A four-axis laser welding device (3), characterized in that, include: Four-axis drive unit (2); A laser welding device (3) is mounted on the four-axis drive device (2); The first displacement device (4) is located at one end of the four-axis drive device (2) and is used to fix and rotate the first housing (91) and the second housing (90); The third displacement device (6) is located at the other end of the four-axis drive device (2) and is used to fix and rotate the compressor housing; A connecting and fixing device (61) is provided on the third displacement device (6) for fixing the connecting base (94) on the compressor housing and rotating with the compressor housing; The second displacement device (5) is located between the first displacement device (4) and the third displacement device (6) and is used to fix and rotate the compressor housing and the second connecting pipe (92). The four-axis drive device (2) is used to drive the laser welding device (3) to weld the first housing (91) and the second housing (90) on the first positioning device (4) into a compressor housing, to weld the compressor housing and the second pipe (92) on the second positioning device (5) together, and to weld the connecting base (94) on the third positioning device (6) onto the compressor housing.

2. The four-axis laser welding device (3) according to claim 1, characterized in that, The four-axis drive unit (2) includes: Horizontal linear module (21); A vertically moving linear module (22) is disposed on the horizontal slide of the horizontally moving linear module (21); A forward and backward moving linear module (23), wherein the forward and backward moving linear module (23) is disposed on the vertical slide of the vertical moving linear module (22); and Welding rotating module (24) is disposed on the front and rear slides of the front and rear moving linear module (23) and is connected to the laser welding device (3).

3. The four-axis laser welding device (3) according to claim 1, characterized in that, The first displacement device (4) has the same structure as the third displacement device (6), and the first displacement device (4) includes: Displacement base plate (70); Displacement rotation assembly (71), which is disposed at one end of the displacement base plate (70) and is used to fix the second housing (90); Displacement clamping assembly (72), which is slidably disposed at the other end of the displacement base plate (70); A displacement drive assembly (73), which is disposed on the displacement base plate (70) and connected to the displacement clamping assembly (72); and Displacement support assembly (41) is slidably disposed on the displacement base plate (70) and is used to support the first housing (91) and the second housing (90).

4. A four-axis laser welding device (3) according to claim 3, characterized in that, The displacement rotation assembly (71) includes: Displacement fixing seat (711), wherein the displacement fixing seat (711) is disposed at one end of the displacement base plate (70); A displacement spindle (712), the displacement spindle (712) being mounted on the displacement fixing seat (711); and A positioner motor (714) is mounted on the positioner mounting base (711) and connected to the positioner spindle (712).

5. A four-axis laser welding device (3) according to claim 4, characterized in that, The displacement clamping assembly (72) includes: A displacement clamping seat (721), which is slidably disposed at the other end of the displacement base plate (70); and The displacement rotating seat (723) is rotatably mounted on the displacement clamping seat (721) and is arranged opposite to the displacement main shaft (712).

6. A four-axis laser welding device (3) according to claim 3, characterized in that, The displacement support assembly (41) includes: Displacement support base plate (411), wherein the displacement support base plate (411) is slidably disposed on the displacement base plate (70); A displacement support cylinder (412), wherein the displacement support cylinder (412) is disposed on the displacement support base plate (411); and A displacement bracket (413) is mounted on the displacement support cylinder (412) and is provided with a displacement support groove.

7. A four-axis laser welding apparatus (3) according to any one of claims 3 to 6, characterized in that, The connecting and fixing device (61) includes: A connecting fixing frame (611) is provided on the displacement rotation assembly (71); A rotary clamping cylinder (612) is symmetrically arranged on the connecting fixing frame (611) and is used to press the connecting base (94) onto the connecting fixing frame (611); A connecting positioning cylinder (614) is symmetrically arranged on the connecting fixing frame (611) and located on one side of the rotating clamping cylinder (612); and A connecting positioning pin (615) is provided on the connecting positioning cylinder (614) and is used to insert into the connecting hole (941) of the connecting base (94).

8. A four-axis laser welding apparatus (3) according to any one of claims 1 to 6, characterized in that, The second displacement device (5) includes: Second base plate (55); A hollow rotating platform (54) is mounted on the second base plate (55); An eccentric disk (53) is disposed on the hollow rotating platform (54); Housing clamping assembly (52), which is disposed on the eccentric plate (53) and is used to clamp the compressor housing; A pipe clamping assembly (51) is provided on the second base plate (55) for fixing the second pipe (92) to the compressor housing, and the second pipe (92) is coaxially arranged with the hollow rotating platform (54).

9. A four-axis laser welding device (3) according to claim 8, characterized in that, The housing clamping assembly (52) includes: The housing clamping sleeve (521) is provided on the eccentric disk (53) and has waist-shaped tensioning grooves (5211) symmetrically provided on both sides; The housing tensioning sleeve (522) is movably disposed within the housing clamping sleeve (521) and is provided with a plurality of tensioning grooves (5222) and tensioning shafts (5221) symmetrically disposed on both sides. The tensioning shafts (5221) are movably inserted into the tensioning slide grooves (5211). A tensioning rod (523), one end of which is rotatably mounted on the eccentric disc (53), and has a waist-shaped tensioning drive groove (5231), which is slidably mounted on the tensioning shaft (5221); and Tensioning cylinder (525) is rotatably mounted on the eccentric disk (53) and rotatably connected to the other end of the tensioning rod (523).

10. A four-axis laser welding device (3) according to claim 8, characterized in that, The pipe clamping assembly (51) includes: A pipe support (514) is mounted on the second base plate (55); A pipe moving cylinder (513) is disposed on the top of the pipe support (514); A cross slide (512), said cross slide (512) being mounted on the connecting pipe moving cylinder (513); and A pipe fixing cylinder (511) is provided on the cross slide (512) and is used to clamp the second pipe (92).

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