CN210548861U

CN210548861U - Pipeline laser-beam welding machine

Info

Publication number: CN210548861U
Application number: CN201920626612.XU
Authority: CN
Inventors: 杨宝燕; 伍涛
Original assignee: Guangdong Gking Laser Technology Co ltd
Current assignee: Guangdong Gking Laser Technology Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-05-19
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a pipeline laser welding machine, which comprises an electric rotating platform and a clamping and positioning device which are arranged on a machine base, wherein the clamping and positioning device comprises a positioning frame and a pipeline clamping mechanism which is arranged above the center of the electric rotating platform, a pipe joint positioning device is arranged on the electric rotating platform which is arranged below the pipeline clamping mechanism, a laser welding device is also arranged on the electric rotating platform, the laser welding device comprises a laser alignment component, a light path guide component and a laser focusing component which are connected with a laser generator, the laser alignment component is fixed on the machine base which is arranged below the center of the electric rotating platform, the light path guide component is fixedly arranged on the electric rotating platform, one end of the light path guide component corresponds to the laser alignment component, the other end of the light path guide component is connected with the laser focusing component, the laser focusing component faces between the, and can also effectively prevent the bending deformation of the gas pipe to be welded caused by the swinging.

Description

Pipeline laser-beam welding machine

Technical Field

The utility model relates to a laser welding technical field, in particular to pipeline laser-beam welding machine.

Background

When the existing gas pipe laser welding machine is used for welding a gas pipe and a pipe joint, the gas pipe and the pipe joint are rotated to weld a seam for one circle, or a laser welding device winds the seam for one circle to complete welding; when the gas pipe is rotated for welding, the gas pipe is long, so that the gas pipe is easy to swing in the rotating process, is easy to bend and deform, and particularly the corrugated pipe is easy to break; and through the mode of laser welding device coil welding, optic fibre twines easily on equipment, also leads to optic fibre to damage because of fatigue damage simultaneously easily. Therefore, there is a need for improvements and optimizations to the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a pipeline laser-beam welding machine to prevent pipeline bending deformation and optical fiber winding.

In order to overcome the defects of the prior art, the utility model provides a following technical scheme:

the utility model provides a pipeline laser-beam welding machine, is including installing electric turntable and the centre gripping positioner on the frame, centre gripping positioner includes the locating rack and arranges the pipeline fixture of electric turntable center top in, be equipped with coupling positioner on the electric turntable of pipeline fixture below, still be equipped with laser welding device on the electric turntable, laser welding device is including laser alignment subassembly, light path direction subassembly and the laser focusing subassembly of connecting laser generator, the laser alignment subassembly is fixed on the frame of electric turntable center below, light path direction subassembly fixed mounting is on electric turntable, and its one end corresponds with the laser alignment subassembly, and the other end is connected with the laser focusing subassembly, the laser focusing subassembly is towards between pipeline fixture and the coupling positioner.

Preferably, the device further comprises a visual observation system, the visual observation system comprises a CCD camera arranged at one end of the laser focusing assembly, which is far away from the light outlet end, a laser total reflection visible light full lens sheet is arranged in the laser focusing assembly, the tail section of the light path guide assembly faces the laser total reflection visible light full lens sheet, and the angle of a connecting line between the laser total reflection visible light full lens sheet and the CCD camera to the light outlet end of the laser focusing assembly is equal to the angle of the connecting line between the laser total reflection visible light full lens sheet and the tail section of the light path guide assembly. The tail section of the light path guide assembly is perpendicular to the laser focusing assembly, and the angle of a connecting line between the laser total reflection visible light total lens and the CCD camera to the light outlet end of the laser focusing assembly and the angle of the connecting line between the laser total reflection visible light total lens and the tail section of the light path guide assembly are both 45 degrees.

Preferably, the laser focusing assembly comprises a laser output head, and a focusing lens and a protective lens which are arranged at the end part of the laser output head, wherein the protective lens is arranged on the outer side of the focusing lens.

Preferably, the focusing lens is installed inside the end of the laser output head, a cooling channel surrounding the laser output head is arranged on the laser output head corresponding to the focusing lens, at least two cooling water interfaces communicated with the cooling channel are arranged, and the cooling water interfaces are used for being connected with cooling water.

Preferably, the end part of the laser output head is also provided with a conical protective cover, the protective cover is provided with a protective gas interface, the end part is provided with a laser outlet, and the protective gas interface is used for connecting an inert gas source.

Preferably, the light path direction subassembly includes a first light path protection section of thick bamboo, a second light path protection section of thick bamboo and a third light path protection section of thick bamboo, electronic revolving stage center is arranged in to a first light path protection section of thick bamboo, and its lower extreme corresponds with laser collimation subassembly upper end, a second light path protection section of thick bamboo and a first light path protection section of thick bamboo and a third light path protection section of thick bamboo all set up perpendicularly, laser focusing subassembly is perpendicular with a third light path protection section of thick bamboo, between a first light path protection section of thick bamboo and a second light path protection section of thick bamboo, between a second light path protection section of thick bamboo and a third light path protection section of thick bamboo, laser focusing subassembly inboard is equipped with first reflection of light lens, second reflection of light lens, third reflection of light lens respectively, the angle between first reflection of light lens and a first light path protection section of thick bamboo and a second light path protection section of thick bamboo and a third light path protection section of thick bamboo is 45, and the angles among the third reflective lens, the third light path protection barrel and the light emergent direction of the laser focusing assembly are both 45 degrees.

Preferably, the laser collimation assembly comprises a collimation light cylinder, the lower end of the collimation light cylinder is provided with an optical fiber interface connected with the laser generator, and the upper end of the collimation light cylinder is provided with a collimation lens.

Preferably, the pipeline clamping mechanism comprises a vertical driving mechanism arranged on the positioning frame and a clamping positioning plate driven by the vertical driving mechanism to move up and down, and the clamping positioning plate is provided with a fixed reference clamping block and a movable clamping block driven by the horizontal driving mechanism to move towards or away from the reference clamping block.

Preferably, the pipe joint positioning device comprises a support fixed on the electric rotating table and a pipe joint positioning seat fixed on the support, wherein a positioning bearing is arranged in the pipe joint positioning seat and is positioned above the center of the electric rotating table.

Preferably, the electric rotating table downside middle part dress is on reduction gear box, reduction gear box dress is on the frame and is connected with driving motor, laser alignment subassembly is fixed in reduction gear box downside middle part, reduction gear box middle part is equipped with well kenozooecium, light path direction subassembly one end stretches into well kenozooecium from electric rotating table center to correspond with laser alignment subassembly upper end.

Has the advantages that: the gas pipe to be welded and the pipe joint of the gas pipe are respectively positioned by the pipeline clamping mechanism and the pipe joint positioning device, so that the gas pipe and the pipe joint of the gas pipe are kept still in the welding process, the laser alignment assembly is fixed on the base, the light path guide assembly and the laser focusing assembly rotate along with the electric rotating table, and the welding of the gas pipe and the pipe joint of the gas pipe is completed by one circle around the pipe joint of the gas pipe to be welded and the pipe joint of the gas pipe to be welded, so that the laser alignment assembly is also kept still, the position fixing of the gas pipe to be welded and the optical fiber used for connecting the laser generator is realized, the rotation of two longer accessories of the gas pipe to be welded and the optical fiber is effectively avoided, the problems that the optical fiber is easy to wind on equipment and generates fatigue damage are.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is a schematic view of a three-dimensional viewing angle structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a half-section structure of a laser welding apparatus according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structural view of a laser focusing assembly according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional structural view of an optical path guiding assembly according to an embodiment of the present invention;

fig. 5 is a schematic view of a three-dimensional view structure of a pipe joint positioning device according to an embodiment of the present invention.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 5, a pipeline laser welding machine comprises an electric rotating table 100 and a clamping and positioning device 200 which are installed on a machine base, wherein the clamping and positioning device 200 comprises a positioning frame 210 and a pipeline clamping mechanism 220 which is arranged above the center of the electric rotating table 100, a pipe joint positioning device 300 is arranged on the electric rotating table 100 below the pipeline clamping mechanism 220, a laser welding device 400 is further arranged on the electric rotating table 100, the pipeline clamping mechanism 220 is used for clamping a gas pipe X to be welded and enabling the gas pipe X to be arranged above the center of the electric rotating table 100, the pipe joint positioning device 300 is used for positioning a gas pipe joint Y to be welded and is also arranged above the center of the electric rotating table 100, after positioning is finished, the lower end of the gas pipe X to be welded corresponds to and fully contacts with the gas pipe joint Y, and then when the laser welding device 400 rotates, and welding the lower end of the gas pipe X to be welded and the joint Y of the gas pipe joint Y for one circle around the joint to realize laser welding.

Specifically, the positioning frame 210 comprises a vertical column 211 fixed on the machine base and a cantilever 212 connected to the top end of the vertical column 211, the end of the cantilever 212 is provided with a vertical plate 213, the pipe clamping mechanism 220 comprises a vertical driving mechanism 221 mounted on the vertical plate 213 and a clamping positioning plate 222 driven by the vertical driving mechanism 221 to move up and down, the vertical driving mechanism 221 adopts an air cylinder, the clamping positioning plate 222 is fixed at the lower end of an air cylinder rod of the air cylinder, the clamping positioning plate 222 is provided with a fixed reference clamping block 223 and a movable clamping block 225 driven by a horizontal driving mechanism 224 to move towards or away from the reference clamping block 223, the horizontal driving mechanism 224 also adopts an air cylinder, the movable clamping block 225 is fixed at the end of the air cylinder rod of the air cylinder, when a gas pipe X to be welded is clamped, the gas pipe X abuts against the reference clamping block 223, and then the horizontal driving mechanism 224 drives the movable, the gas pipe X to be welded is clamped between the reference clamping block 223 and the movable clamping block 225, the clamped and positioned gas pipe X to be welded is just positioned above the center of the electric rotating platform 100, in addition, the opposite surfaces of the reference clamping block 223 and the movable clamping block 225 are respectively provided with an arc cylindrical surface groove matched with the surface of the gas pipe X to be welded, so that the gas pipe X to be welded can be clamped, and when the reference clamping block 223 is installed, the center of the arc cylindrical surface groove on the reference clamping block 223 is just aligned to the rotating center of the electric rotating platform 100, which is to ensure that the gas pipe X to be welded and the pipe joint Y of the gas pipe are kept still when the electric rotating platform 100 rotates, so that the laser welding device 400 can be welded around the gas pipe X; and through the setting of above-mentioned structure, make the centre gripping of treating welding gas pipe X very swift, be convenient for adjust from top to bottom after the centre gripping simultaneously to be convenient for make treat welding gas pipe X and gas pipe coupling Y abundant contact, so that weld.

The pipe joint positioning device 300 comprises a support 310 fixed on the electric rotating platform 100 and a pipe joint positioning seat 320 fixed on the support 310, wherein a positioning bearing 330 is arranged in the pipe joint positioning seat 320, the positioning bearing 330 is positioned above the center of the electric rotating platform 100, a gas pipe joint Y can be directly inserted and positioned in an inner ring of the positioning bearing 330, a positioning head 331 can also be arranged in the inner ring of the positioning bearing 330, and then the gas pipe joint Y is sleeved at the top end of the positioning head 331.

In order to solve the problem that optical fibers are easy to wind during welding, the laser welding device 400 is arranged in such a way, and comprises a laser alignment component 410, a light path guide component 420 and a laser focusing component 430 which are connected with a laser generator, wherein the laser alignment component 410 is fixed on a machine base below the center of the electric rotating table 100, the light path guide component 420 is fixedly installed on the electric rotating table 100, the lower end of the light path guide component corresponds to the laser alignment component 410, the upper end of the light path guide component is connected with the laser focusing component 430, the laser focusing component 430 faces between the pipeline clamping mechanism 220 and the pipe joint positioning device 300, an L-shaped installation support plate 130 can be fixed on the electric rotating table 100 specifically through the laser focusing component 430, then the laser focusing component 430 is fixed on the installation support plate 130, and then the light path guide. Because the laser alignment assembly 410 is fixed on the machine base, when the electric rotating platform 100 rotates, the laser alignment assembly 410 is always kept still, only the light path guide assembly 420 and the laser focusing assembly 430 fixed on the electric rotating platform 100 rotate along with the electric rotating platform 100, because the lower end of the light path guide assembly 420 always corresponds to the laser alignment assembly 410 in the rotation process, after passing through the laser alignment assembly 410, laser finally passes through the light path guide assembly 420 and is emitted from the end part of the laser focusing assembly 430, the emitted high-energy laser acts on the joint between the gas pipe X to be welded and the pipe joint Y of the gas pipe, the joint between the gas pipe X to be welded and the pipe joint Y of the gas pipe is rapidly melted, so that the laser alignment assembly 410 and the gas pipe X to be welded are welded together, in the process, the optical fiber Z used for connecting the laser generator is kept still, the gas pipe X to be welded is also not moved, but welding is completed by the light path, thereby two kinds of longer accessories of effectual having avoided treating welding gas pipe X and optic fibre Z rotate, can not only solve optic fibre Z and twine easily on equipment and produce the problem of fatigue damage, also can effectually prevent to treat that welding gas pipe X causes bending deformation or fracture because of the swing.

Preferably, a visual observation system 440 is further included, the visual observation system 440 includes a CCD camera 441 mounted at an end of the laser focusing assembly 430 away from the light exit end, a laser total reflection visible light total transmission lens 431 is disposed in the laser focusing assembly 430, the end section of the light path guiding assembly 420 faces the laser total reflection visible light total transmission lens 431, and an angle between the laser total reflection visible light total transmission lens 431 and a connecting line between the CCD camera 441 and the light exit end of the laser focusing assembly 430 is equal to an angle between the end sections of the light path guiding assembly 420. Specifically, in implementation, the laser focusing assembly 430 is horizontally arranged, then the end section of the light path guiding assembly 420 is arranged to be perpendicular to the laser focusing assembly 430, and the angle of a connecting line between the laser total reflection visible light total transmission lens 431 and the light emitting end of the laser focusing assembly 430 from the CCD camera 441 and the angle of the connecting line between the laser total reflection visible light total transmission lens 431 and the end section of the light path guiding assembly 420 are both 45 °, so that the laser passes through the light path guiding assembly 420, and then is emitted at 45 ° to the laser total reflection visible light total lens 431, and is reflected in the horizontal direction, and since the laser total reflection visible light total lens 431 can transmit visible light, the CCD camera 441 can observe the condition of the welding position in real time, thereby facilitating observation.

Preferably, the laser focusing assembly 430 includes a laser output head 432, and a focusing lens 433 and a protection lens 434 which are installed at an end portion of the laser output head 432, the protection lens 434 is disposed outside the focusing lens 433, and focuses the laser entering the laser focusing assembly 430 through the focusing lens 433, so that the finally emitted laser beam is more concentrated and acts on a joint between a gas pipe X to be welded and a gas pipe joint Y, and the protection lens 434 can prevent slag generated during welding from splashing on the focusing lens 433, thereby effectively protecting the focusing lens 433 and ensuring a focusing effect. Specifically, the focusing lens 433 is installed at the inner side of the end portion of the laser output head 432, a cooling channel 435 surrounding the laser output head 432 is arranged on the laser output head 432 corresponding to the focusing lens, and two cooling water interfaces 436 communicated with the cooling channel 435 are arranged, the cooling water interfaces 436 are used for connecting cooling water, one of the cooling water interfaces is used for connecting a water inlet pipe, the other cooling water interface is used for connecting a water outlet pipe, so that the flow of the cooling water is realized, and the edge of the focusing lens 433 is continuously cooled for one circle. In addition, the end part of the laser output head 432 is also provided with a conical protective cover 437, the protective cover 437 is provided with a protective gas interface 438, the end part is provided with a laser outlet 439, the protective gas interface 438 is used for connecting an inert gas source, the focused laser beam is emitted from the laser outlet 439, and the inner side of the protective cover 437 is kept in a positive pressure environment due to the fact that the inert gas is continuously introduced, so that smoke generated during welding can be effectively prevented from entering, observation is facilitated, and the inert gas is nitrogen or argon, is colorless and odorless, and is favorable for keeping a good observation environment; meanwhile, as the continuously introduced inert gas passes through the laser outlet 439 and is sprayed at the welding opening, the welding opening can be effectively prevented from being oxidized, the surface is bright after welding, and no additional treatment is needed, so that the welding quality is greatly improved, and the problems of surface blackness, 40674c and additional polishing caused by argon arc welding and other welding modes are effectively solved.

Preferably, the optical path guiding assembly 420 includes a first optical path protecting cylinder 421, a second optical path protecting cylinder 422 and a third optical path protecting cylinder 423, the first optical path protecting cylinder 421 is disposed at the center of the electric rotating platform 100, and the lower end of the first optical path protecting cylinder corresponds to the upper end of the laser collimating assembly 410, the second optical path protecting cylinder 422, the first optical path protecting cylinder 421 and the third optical path protecting cylinder 423 are both vertically disposed, the laser focusing assembly 430 is perpendicular to the third optical path protecting cylinder 423, a first reflective lens 424, a second reflective lens 425 and a third reflective lens 431 'are respectively disposed at the inner side of the laser focusing assembly 430, between the first optical path protecting cylinder 421 and the second optical path protecting cylinder 422, between the second optical path protecting cylinder 422 and the third optical path protecting cylinder 423, wherein the third reflective lens 431' directly follows the laser total reflection visible light total transmission lens 431 in the foregoing embodiments, and the angles between the first reflective lens 424, the first optical path protecting cylinder 421 and the second optical path protecting cylinder 423 are both 45 degrees, 422, 425 degrees, the angles between the second reflecting mirror 425 and the second and third light

path protecting cylinders

422 and 423 are all 45 degrees, the angles between the third reflective lens 431 ' and the light-emitting directions of the third light path protection cylinder 423 and the laser focusing assembly 430 are also 45 degrees, the laser emitted from the laser collimating assembly 410 is emitted to the first reflective lens 424 through the first light path protection cylinder 421, is emitted to the second reflective lens 425 from the second light path protection cylinder 422 after being reflected, is emitted to the third reflective lens 431 ' (namely the laser total reflection visible light total transmission lens 431) from the third light path protection cylinder 423 after being reflected again, and is emitted after being reflected by the third reflective lens 431 ' and focused by the focusing lens 433, so that the laser is only reflected three times, and the laser paths are horizontal or vertical, which is beneficial to butt joint with the laser alignment assembly 410 and finally act on the joint between the gas pipe X to be welded and the gas pipe joint Y.

Preferably, the laser collimating assembly 410 includes a collimating light tube 411, the lower end of the collimating light tube 411 is provided with an optical fiber interface 412 connected with a laser generator, the upper end of the collimating light tube is provided with a collimating lens 413, an optical fiber Z is connected to the optical fiber interface 412, laser enters the collimating light tube 411 from the optical fiber interface 412 through the optical fiber Z, and vertically enters the first light path protecting tube 421 from bottom to top after passing through the collimating lens 413, so that the laser can always keep the stability of the entering direction when the first light path protecting tube 421 rotates.

Preferably, the middle part of the lower side of the electric rotating platform 100 is installed on the reduction gear box 110, the reduction gear box 110 is installed on the base and connected with the driving motor 120, the laser alignment assembly 410 is fixed in the middle part of the lower side of the reduction gear box 110, the middle part of the reduction gear box 110 is provided with the hollow part 111, one end of the light path guide assembly 420 extends into the hollow part 111 from the center of the electric rotating platform 100 and corresponds to the upper end of the laser alignment assembly 410, specifically, in implementation, a through hole can be arranged in the middle part of the electric rotating platform 100, the first light path protection cylinder 421 extends into the hollow part 111 from the through hole, in order to maintain the stability of the rotation, a bearing can be installed between the light path guide assembly and the reduction gear box 110, in operation, the driving motor 120 drives the electric rotating platform 100 to rotate through the reduction gear box 110, the first light path protection, thereby realizing welding; in addition, the laser alignment assembly 410 may also extend from the hollow portion 111 and the through hole to the upper side of the electric rotating table 100, and then the upper end of the laser alignment assembly 410 at the lower end of the first light path protection cylinder 421 is in sliding contact with the upper end of the first light path protection cylinder, so that the circulation of the laser may also be realized.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides a pipeline laser-beam welding machine which characterized in that: including installing electric rotating table (100) and centre gripping positioner (200) on the frame, centre gripping positioner (200) include locating rack (210) and arrange pipeline fixture (220) of electric rotating table (100) center top in, be equipped with pipe joint positioner (300) on electric rotating table (100) of pipeline fixture (220) below, still be equipped with laser welding device (400) on electric rotating table (100), laser welding device (400) are including laser alignment subassembly (410), light path direction subassembly (420) and laser focusing subassembly (430) of connecting laser generator, laser alignment subassembly (410) are fixed on the frame of electric rotating table (100) center below, light path direction subassembly (420) fixed mounting is on electric rotating table (100), and its one end corresponds with laser alignment subassembly (410), the other end of the pipe joint positioning device is connected with a laser focusing assembly (430), and the laser focusing assembly (430) faces to the position between the pipe clamping mechanism (220) and the pipe joint positioning device (300).

2. The pipeline laser welding machine of claim 1, wherein: the visual observation system (440) comprises a CCD camera (441) arranged at one end, deviating from the light emitting end, of the laser focusing assembly (430), a laser total reflection visible light full lens sheet (431) is arranged in the laser focusing assembly (430), the tail section of the light path guide assembly (420) faces the laser total reflection visible light full lens sheet (431), and the angle of a connecting line between the laser total reflection visible light full lens sheet (431) and the CCD camera (441) to the light emitting end of the laser focusing assembly (430) is equal to the angle between the tail sections of the light path guide assembly (420).

3. The pipeline laser welding machine of claim 1, wherein: the laser focusing assembly (430) comprises a laser output head (432), and a focusing lens (433) and a protective lens (434) which are arranged at the end part of the laser output head (432), wherein the protective lens (434) is arranged on the outer side of the focusing lens (433).

4. The pipeline laser welding machine of claim 3, wherein: the focusing lens (433) is arranged on the inner side of the end part of the laser output head (432), a cooling channel (435) which surrounds the laser output head (432) in a circle is arranged on the laser output head (432) corresponding to the focusing lens, at least two cooling water interfaces (436) communicated with the cooling channel (435) are arranged, and the cooling water interfaces (436) are used for being connected with cooling water.

5. The pipeline laser welding machine of claim 3, wherein: the end part of the laser output head (432) is also provided with a conical protective cover (437), a protective gas interface (438) is arranged on the protective cover (437), the end part is provided with a laser outlet (439), and the protective gas interface (438) is used for connecting an inert gas source.

6. The pipeline laser welding machine of claim 1, wherein: light path direction subassembly (420) are including a first light path protection section of thick bamboo (421), a second light path protection section of thick bamboo (422) and a third light path protection section of thick bamboo (423), an electronic revolving stage (100) center is arranged in to a first light path protection section of thick bamboo (421), and its lower extreme corresponds with laser collimation subassembly (410) upper end, a second light path protection section of thick bamboo (422) and a first light path protection section of thick bamboo (421) and a third light path protection section of thick bamboo (423) all set up perpendicularly, laser focusing subassembly (430) are perpendicular with a third light path protection section of thick bamboo (423), between a first light path protection section of thick bamboo (421) and a second light path protection section of thick bamboo (422), between a second light path protection section of thick bamboo (422) and a third light path protection section of thick bamboo (423), laser focusing subassembly (430) inboard is equipped with first reflection of light lens (424), second reflection lens (425), third reflection lens (431') respectively, first reflection lens (424) and first light path protection section of thick bamboo (421) and second light path protection section of thick bamboo (422) The angles among the second reflecting lens (425), the second light path protection cylinder (422) and the third light path protection cylinder (423) are both 45 degrees, and the angles among the third reflecting lens (431'), the third light path protection cylinder (423) and the light emitting direction of the laser focusing assembly (430) are both 45 degrees.

7. The pipeline laser welding machine of claim 1, wherein: the laser collimation assembly (410) comprises a collimation light cylinder (411), wherein the lower end of the collimation light cylinder (411) is provided with an optical fiber interface (412) connected with a laser generator, and the upper end of the collimation light cylinder is provided with a collimation lens (413).

8. A pipeline laser welder according to any of claims 1-7, characterized by: the pipeline clamping mechanism (220) comprises a vertical driving mechanism (221) arranged on the positioning frame (210) and a clamping positioning plate (222) driven by the vertical driving mechanism (221) to move up and down, wherein a fixed reference clamping block (223) and a movable clamping block (225) driven by a horizontal driving mechanism (224) to face or depart from the reference clamping block (223) are arranged on the clamping positioning plate (222).

9. A pipeline laser welder according to any of claims 1-7, characterized by: the pipe joint positioning device (300) comprises a support (310) fixed on the electric rotating table (100) and a pipe joint positioning seat (320) fixed on the support (310), wherein a positioning bearing (330) is arranged in the pipe joint positioning seat (320), and the positioning bearing (330) is positioned above the center of the electric rotating table (100).

10. A pipeline laser welder according to any of claims 1-7, characterized by: electric rotating table (100) downside middle part dress is on reduction gear box (110), reduction gear box (110) dress is on the frame and is connected with driving motor (120), laser alignment subassembly (410) are fixed at reduction gear box (110) downside middle part, reduction gear box (110) middle part is equipped with well kenozooecium (111), well kenozooecium (111) is stretched into from electric rotating table (100) center to light path direction subassembly (420) one end to correspond with laser alignment subassembly (410) upper end.