A laser tracking and positioning device for circumferential welding of corrugated pipes

Abstract

The present invention relates to the technical field of laser welding, and specifically to a laser tracking and positioning device for bellows circumferential seam welding, comprising a workbench and a laser welding assembly, wherein the laser welding assembly comprises a column and a welding gun, wherein the column is coaxially rotatably mounted on the center of the top surface of the workbench, and both ends extend to the upper and lower sides of the workbench respectively, the welding gun is hinged on the upper end surface of the column, and a mounting seat is coaxially fixedly mounted on the top center of the workbench; the present invention changes the length of the slider extending out of the mounting seat by setting a slider and a limiting flange until the coaxial positioning of the two bellows workpieces and the mounting seat is completed; since the welding track of the welding gun and the mounting seat are coaxial circles, the coaxiality between the welding track of the head of the welding gun and the inner side wall of the bellows workpiece is guaranteed, thereby ensuring that the radial distance from the head of the welding gun to the inner side wall of the bellows workpiece at any point within the welding track is the same, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, in particular to a laser tracking and positioning device for bellows girth welding. Background Art

[0002] Welded bellows are formed by welding bellows workpieces or diaphragms layer by layer. Compared with conventional bellows manufactured by hydraulic forming or mechanical bulging, welded bellows are multi-layer thin-wall structures connected by multiple independent annular welds. They have higher pressure bearing capacity, longer fatigue life and stronger rigidity. They are often used in high-strength, high-pressure, high-temperature resistant and precision sealed piping systems such as semiconductor production equipment, aerospace, nuclear power industry and petrochemical equipment.

[0003] When welding and forming the welded bellows, the girth weld is divided into the inner girth weld and the outer girth weld. When welding the inner girth weld, the existing fixtures mostly use outer diameter positioning and clamping, and the wall thickness of the bellows workpiece is relatively thin, usually 0.1-0.5mm. It is easily affected by thermal deformation and twisted during welding, and conventional contact positioning is prone to stress concentration, resulting in the inner wall of the bellows workpiece being elliptical. The roundness error will cause the coaxiality of the inner walls of the two bellows workpieces to decrease, resulting in the welding quality cannot be guaranteed; at the same time, ensure that the laser beam of the laser welding head is at the optimal welding point of the two bellows workpieces during welding, resulting in the weld quality cannot be guaranteed. Summary of the Invention

[0004] The purpose of the present invention is to provide a laser tracking and positioning device for bellows girth welding, so as to solve the problem that the welding quality of the inner girth weld of the bellows cannot be guaranteed when welding the inner girth weld.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A laser tracking and positioning device for bellows circumferential seam welding includes a workbench and a laser welding assembly. Specifically, the laser welding assembly includes a laser generator, a column, a cable, a No. 1 rocker arm, a No. 2 rocker arm and a welding gun. The laser generator is fixedly mounted on the bottom surface of the workbench, the column is rotatably mounted on the laser generator, and the upper end of the column extends to the upper end surface of the workbench, the No. 1 rocker arm is hingedly mounted on the upper end surface of the column, and the freedom direction of the No. 1 rocker arm is horizontal, the No. 2 rocker arm is hingedly mounted on the other end of the No. 1 rocker arm, and the freedom direction of the No. 2 rocker arm is vertical, the welding gun is fixedly mounted on the other end of the No. 2 rocker arm, the two ends of the cable are respectively connected to the laser generator and the welding gun, the column is a hollow structure, and the cable passes through the column. Specifically, a mounting seat is coaxially fixed on the top center of the workbench, and a plurality of sliding grooves are opened on the side walls of the mounting seat, and sliders are slidably installed in the plurality of sliding grooves, and the ends of the plurality of sliders away from the center of the mounting seat extend outside the mounting seat, and a limiting flange is provided on the end of the slider extending outside the mounting seat, and the lower end surface of the limiting flange is flush with the lower end surface of the slider, and the thickness of the limiting flange is smaller than the thickness of the slider, and a driving assembly is provided in the mounting seat, and the driving assembly is used to synchronously drive the plurality of sliders to extend to the length outside the mounting seat.

[0007] By setting the slider and the limiting flange, before welding the two bellows workpieces, the driving assembly drives the slider to extend the length outside the mounting seat until the inner ring of the bellows workpiece overlaps the limiting flange, the driving assembly is stopped, and the two bellows workpieces to be welded are placed on the upper end surface of the limiting flange in the order of arrangement; at this time, due to the gravity of the upper bellows workpiece, the two bellows workpieces fit together, and the lower bellows workpiece fits the upper end surface of the limiting flange; restart the driving assembly, the slider The length of the block extending outside the mounting seat increases until the ends of the multiple sliders away from the mounting seat all abut against the inner wall of the bellows workpiece, completing the coaxial positioning of the two bellows workpieces and the mounting seat; since the welding track of the welding gun and the mounting seat are coaxial circles, the coaxiality between the welding track of the welding gun head and the inner wall of the bellows workpiece is guaranteed, and thus the radial distance from the welding gun head to the inner wall of the bellows workpiece at any point within the welding track is guaranteed to be the same, thereby ensuring the welding quality of the inner welds of the two bellows workpieces. At the same time, the coaxial positioning between the two bellows workpieces and the mounting seat adopts the inner wall of the bellows workpiece for positioning, and the number of positioning points is multiple, thereby avoiding the problem that the wall of the bellows workpiece is twisted and deformed due to uneven force, resulting in the actual center of the two bellows workpieces being out of center with the mounting seat, thereby ensuring the coaxiality between the welding track of the welding gun head and the inner wall of the bellows workpiece, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

[0008] Preferably, the driving assembly includes a threaded tube, a driving motor, a No. 1 gear and a No. 2 gear, and the threaded tube comprises a mounting section, a threaded section and a conical section from bottom to top, respectively; a threaded hole is coaxially opened on the mounting seat and passes through the upper and lower ends, and the threaded section is threadedly connected to the threaded hole; the driving motor is fixedly mounted on the lower side of the workbench; the No. 1 gear is coaxially fixedly mounted on the output shaft of the driving motor; the mounting section extends to the lower side of the workbench; the No. 2 gear is coaxially fixedly connected to the mounting section; the No. 1 gear and the No. 2 gear are meshed with each other; the outer wall of the conical section is a frustum with the small end on top; a plurality of sliders are provided with a conical mating surface on one end of the mounting seat; the plurality of conical mating surfaces have the same taper as the conical section, and are all magnetically connected or slidably connected.

[0009] The driving motor drives the No. 1 gear to rotate, and the No. 1 gear drives the No. 2 gear to rotate, and the threaded tube rotates with the No. 2 gear. When the threaded tube rotates, it moves upward or downward in the threaded hole, and the slider is slidably connected and magnetically connected to the conical surface section of the threaded tube. When the threaded tube moves upward, it pushes the slider to move toward the outside of the mounting seat, and the length of the slider extending out of the mounting seat increases. When the threaded tube moves downward, the slider moves toward the inside of the mounting seat under the action of magnetic attraction, and the length of the slider extending out of the mounting seat decreases; thereby completing the control of the length of the slider extending out of the mounting seat; adopting the threaded drive method, compared with hydraulic drive and gas drive, the stroke and driving force of the threaded drive are better controlled, and the threaded drive has no impact load, which avoids the slider impacting the inner wall of the bellows workpiece, causing deformation or damage to the bellows workpiece, thereby ensuring the roundness of the inner wall of the bellows workpiece and the workpiece quality, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

[0010] Preferably, a plurality of the sliders are provided with a spring at one end of a limiting flange, and the spring includes a connecting portion and a buffer portion, and the connecting portion is fixedly mounted on the slider. The number of buffer portions of each spring is 2, and they are symmetrically arranged at both ends of the connecting portion, and the two buffer portions extend outside the slider. The vertical projection of the connecting portion and the spring is an arc, and the opening of the arc faces away from the mounting seat, and the free deformation direction of the buffer portion is horizontal.

[0011] By providing an arcuate spring leaf at the end of the slider, when the slider extends out of the mounting seat to align the inner sidewall of the metal ring, the end of the buffer portion away from the connecting portion first abuts the inner sidewall of the metal ring. The buffer portion is deformable, thereby reducing the impact force between the connecting portion and the metal ring, preventing the inner sidewall of the bellows workpiece from being impacted and causing deformation or damage to the bellows workpiece, thereby ensuring the roundness and quality of the inner sidewall of the bellows workpiece, and thus ensuring the quality of the inner weld seams of the two bellows workpieces. Furthermore, through the provision of the spring leaf, each spring leaf contacts the inner sidewall of the bellows workpiece at two points, further dispersing the clamping force applied to the inner sidewall of the bellows workpiece, avoiding the problem of distortion and deformation of the bellows workpiece caused by concentrated clamping force. At the same time, multi-point positioning further ensures the coaxiality between the metal ring and the mounting seat, thereby ensuring the quality of the inner weld seams of the two bellows workpieces.

[0012] Preferably, a guide portion is provided at one end of the buffer portion away from the connecting portion, the vertical projection of the guide portion is an arc, and the opening of the arc is facing the direction of the mounting seat, and the maximum rotation diameter of the guide portion rotating along the axis of the mounting seat is smaller than the maximum rotation diameter of the limiting flange rotating along the axis of the mounting seat.

[0013] In order to avoid thermal deformation of the two bellows workpieces during the welding process, segmented welding is usually used to weld the two bellows workpieces. Therefore, when welding the inner walls of the two bellows workpieces, the area between the multiple sliders is first welded. After the segmented welding is completed, the bellows workpiece is rotated to rotate the unwelded area between the sliders, and the unwelded area is welded continuously by segmented welding until a complete circumferential weld is formed. Since after the first segmented welding, there are welded welds on the inner walls of the two bellows workpieces, and there is a deviation in the inner diameter size of the welded welds and the unwelded welds, through the setting of the guide part, when the bellows workpiece is rotated, the arc-shaped setting of the guide part can more smoothly transition from the unwelded weld to the welded weld, avoiding the problem of jamming of the bellows workpiece during rotation, which causes the bellows workpiece to twist and deform under the action of torque, and ensures the coaxiality between the metal ring and the mounting seat, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

[0014] Preferably, a pressure block is provided on the upper end surface of each of the limiting flanges, and the pressure block includes a mounting portion, a deformation portion and a limiting portion. The mounting portion is fixedly mounted on the slider, and the deformation portion is provided at the upper end of the mounting portion. The cross-sections of the mounting portion and the deformation portion are in the shape of a "7", and the limiting portion is provided at the lower end surface of the deformation portion. The maximum rotation diameter of the limiting portion when rotating along the axis of the mounting seat is greater than the maximum rotation diameter of the guide portion when rotating along the axis of the mounting seat.

[0015] By arranging a pressure block on the limiting flange, when the slider extends out of the mounting seat to align the inner wall of the metal ring, the limiting plate first abuts the inner wall of the corrugated pipe workpiece. As the slider continues to slide toward the outside of the mounting seat, the pressure on the limiting plate increases, and the limiting plate tilts. According to the lever principle, the deformation portion bends at the position connected to the mounting portion, and the end of the deformation portion away from the mounting portion displaces downward until the end of the deformation portion away from the mounting portion abuts against the upper end surface of the upper corrugated pipe workpiece. The deformation portion presses the upper corrugated pipe workpiece downward to ensure the fit between the two corrugated pipe workpieces, thereby ensuring the welding quality of the weld.

[0016] Preferably, an installation groove is provided on the bottom wall of the slide groove, and the installation groove has the same path direction as the slide groove. A limit block is provided on the lower end surface of the slider, and the limit block extends into the installation groove. A pressure spring is provided in the installation groove, and the two ends of the pressure spring are respectively fixedly connected to the inner side wall of the installation groove away from the threaded tube and the limit block.

[0017] By setting the pressure spring, when the slider moves in the direction of extending out of the mounting seat, the pressure spring is compressed, and the spring force of the pressure spring gradually increases, reducing the extension speed of the slider and the impact force between the spring leaf and the metal ring, thus preventing the inner wall of the bellows workpiece from being impacted and causing deformation or damage to the bellows workpiece, thereby ensuring the roundness of the inner wall of the bellows workpiece and the workpiece quality, thereby ensuring the welding quality of the inner welds of the two bellows workpieces. At the same time, when the threaded tube moves downward, the pressure spring releases the spring force and pushes the slider into the mounting seat, avoiding excessive friction between the slider and the slide groove, insufficient magnetic attraction between the conical surface section and the slider, and the problem of the slider being unable to be retracted, thereby ensuring the normal movement of the equipment.

[0018] Preferably, a limiting groove is provided on the upper end surface of the workbench, a dividing motor is slidably mounted on the inner side wall of the limiting groove, a rubber wheel is coaxially fixedly mounted on the output shaft of the dividing motor, the side wall of the rubber wheel is rollingly connected to the outer side wall of the corrugated pipe workpiece to be welded, a magnetic base is fixedly mounted on the side wall of the dividing motor, and the magnetic base is magnetically connected to the upper end surface of the workbench.

[0019] By setting up the indexing motor and the rubber wheel, after the first segmented welding is completed, the rubber wheel is driven to rotate by the indexing motor, and the rubber wheel then drives the corrugated pipe workpiece to rotate, thereby realizing the transfer of the positions of the welded welds and the unwelded welds, and improving the automation of the equipment; by arranging a limit groove on the workbench and locking the indexing motor and the workbench by the magnetic base, the position of the indexing motor can be adjusted steplessly, avoiding the problem of distortion and deformation of the outer side of the corrugated pipe workpiece caused by excessive pressure between the rubber wheel and the corrugated pipe workpiece, thereby ensuring the dimensional accuracy of the corrugated pipe workpiece after the inner ring weld is completed.

[0020] Preferably, a plurality of arc-shaped protrusions are provided on the upper end surface of the limiting flange, and the arc-shaped protrusions are in sliding connection with the corrugated pipe workpiece to be welded. Since the deformation portion exerts downward pressure on the upper corrugated pipe workpiece, and the limiting flange is in surface contact with the lower corrugated pipe workpiece, when the rubber wheel drives the corrugated pipe workpiece to rotate, it is easy to cause excessive friction between the lower corrugated pipe workpiece and the limiting flange, resulting in the rubber wheel being unable to drive the corrugated pipe workpiece to rotate or the rotation angle being deviated. To this end, by providing a plurality of arc-shaped protrusions on the limiting flange, the contact area between the lower corrugated pipe workpiece and the limiting flange is reduced, thereby reducing the friction between the lower corrugated pipe workpiece and the limiting flange, thereby ensuring that the rotation angle of the corrugated pipe workpiece does not deviate, thereby ensuring the welding quality of the inner ring weld.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention, through the arrangement of the slider and the limiting flange, drives the slider to extend out of the mounting seat through the driving assembly until the coaxial positioning of the two bellows workpieces and the mounting seat is completed; since the welding track of the welding gun and the mounting seat are coaxial circles, the coaxiality between the welding track of the welding gun head and the inner wall of the bellows workpiece is ensured, thereby ensuring that the radial distance from the welding gun head to the inner wall of the bellows workpiece at any point within the welding track is the same, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

[0023] 2. The present invention provides an arc-shaped spring at the end of the slider. The buffer portion of the spring reduces the impact force between the connecting portion and the metal ring, thereby ensuring the roundness of the inner wall of the bellows workpiece. Moreover, the spring contacts the inner wall of the bellows workpiece at two points, further dispersing the clamping force applied to the inner wall of the bellows workpiece, thereby avoiding the problem of distortion and deformation of the bellows workpiece caused by concentrated clamping force. At the same time, multi-point positioning further ensures the coaxiality between the metal ring and the mounting seat, thereby ensuring the welding quality of the inner welds of the two bellows workpieces.

[0024] 3. The present invention arranges a pressure block on the limiting flange. When the slider extends out of the mounting seat to align the inner wall of the metal ring, the limiting plate abuts against the inner wall of the bellows workpiece and converts the pressure to the deformation part. The pressure on the deformation part acts on the upper end face of the upper bellows workpiece. The deformation part presses the upper bellows workpiece downward to ensure the fit between the two bellows workpieces, thereby ensuring the welding quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a laser tracking and positioning device for bellows girth welding according to the present invention;

[0026] Figure 2 A top view of a laser tracking and positioning device for bellows girth welding according to the present invention;

[0027] Figure 3 for Figure 2 Full cross-sectional view at AA in the middle;

[0028] Figure 4 for Figure 2 Full cross-section view of the middle BB;

[0029] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0030] Figure 6 This is an exploded view of a slider in a laser tracking and positioning device for bellows girth welding according to the present invention.

[0031] Figure: 1, workbench; 101, limit slot; 2, mounting base; 201, threaded hole; 202, slide; 203, mounting slot; 3, laser welding assembly; 301, laser generator; 302, column; 303, cable; 304, rocker arm No. 1; 305, rocker arm No. 2; 306, welding gun; 4, slider; 401, limit flange; 402, limit block; 5, threaded pipe; 501, installation Segment; 502, threaded segment; 503, conical segment; 6, spring; 601, connecting portion; 602, buffer portion; 603, guide portion; 7, pressure block; 701, mounting portion; 702, deformation portion; 703, limit portion; 8, drive motor; 9, No. 1 gear; 10, No. 2 gear; 11, magnetic base; 12, indexing motor; 13, rubber wheel; 14, bellows workpiece; 15, pressure spring. DETAILED DESCRIPTION

[0032] See also Figures 1 to 6 The present invention provides a laser tracking and positioning device for bellows girth welding, and the technical solution is as follows:

[0033] A laser tracking and positioning device for bellows girth welding, see Figures 1 to 3 、 Figure 5 ; It includes a workbench 1 and a laser welding assembly 3. Specifically, the laser welding assembly 3 includes a laser generator 301, a column 302, a cable 303, a No. 1 rocker arm 304, a No. 2 rocker arm 305 and a welding gun 306. The laser generator 301 is fixedly installed on the bottom surface of the workbench 1, the column 302 is rotatably installed on the laser generator 301, and the upper end of the column 302 extends to the upper end surface of the workbench 1, the No. 1 rocker arm 304 is hingedly installed on the upper end surface of the column 302, and the freedom direction of the No. 1 rocker arm 304 is horizontal, the No. 2 rocker arm 305 is hingedly installed on the other end of the No. 1 rocker arm 304, and the freedom direction of the No. 2 rocker arm 305 is vertical, the welding gun 306 is fixedly installed on the other end of the No. 2 rocker arm 305, and the two ends of the cable 303 are respectively connected to the laser generator 301 and the welding gun 306, the column 302 is a hollow structure, and the cable 303 passes through the column 302. Specifically, a mounting base 2 is coaxially fixedly installed on the top center of the workbench 1, and a plurality of slide grooves 202 are provided on the side wall of the mounting base 2. Slide blocks 4 are slidably installed in the plurality of slide grooves 202. One end of the plurality of slide blocks 4 away from the center of the mounting base 2 extends to the outside of the mounting base 2. A mounting groove 203 is provided on the bottom wall of the slide groove 202. The mounting groove 203 has the same path direction as the slide groove 202. A limit block 402 is provided on the lower end surface of the slide block 4. The limit block 402 extends to the mounting groove 20 3, a pressure spring 15 is provided in the mounting groove 203, and the two ends of the pressure spring 15 are respectively fixedly connected to the inner side wall of the end of the mounting groove 203 away from the threaded tube 5 and the limit block 402; the end of the slider 4 extending to the outside of the mounting seat 2 is provided with a limit flange 401, the lower end surface of the limit flange 401 is flush with the lower end surface of the slider 4, and the thickness of the limit flange 401 is smaller than the thickness of the slider 4, and a plurality of arc-shaped protrusions are provided on the upper end surface of the limit flange 401, and the arc-shaped protrusions are connected to the end to be welded. The bellows workpiece 14 is slidably connected; a driving assembly is provided in the mounting seat 2, and the driving assembly includes a threaded tube 5, a driving motor 8, a number one gear 9 and a number two gear 10. The threaded tube 5 is respectively a mounting section 501, a threaded section 502 and a tapered section 503 from bottom to top. A threaded hole 201 is coaxially opened on the mounting seat 2 and passes through the upper and lower ends. The threaded section 502 is threadedly connected to the threaded hole 201. The driving motor 8 is fixedly mounted on the lower side of the workbench 1. The driving motor 8 needs to adopt a motor with a parking function. The number one gear 9 is coaxially fixedly mounted on the output shaft of the driving motor 8. The mounting section 501 extends to the lower side of the workbench 1. The number two gear 10 is coaxially fixedly connected to the mounting section 501. The number one gear 9 and the number two gear 10 are meshed with each other. The outer wall of the tapered section 503 is a frustum with the small end on top. Multiple sliders 4 are provided on one end of the mounting seat 2 with a tapered mating surface. The multiple tapered mating surfaces have the same taper as the tapered section 503, and are all magnetically connected and slidably connected.

[0034] See also Figure 5and Figure 6 , multiple sliders 4 are provided with a spring 6 at one end of the limited flange 401, the spring 6 includes a connecting portion 601 and a buffer portion 602, the connecting portion 601 is fixedly installed with the slider 4, the buffer portion 602 of each spring 6 is 2, and is symmetrically arranged at both ends of the connecting portion 601, the two buffer portions 602 extend to the outside of the slider 4, the vertical projection of the connecting portion 601 and the spring 6 is an arc, and the arc-shaped opening faces the direction away from the mounting seat 2, and the free deformation direction of the buffer portion 602 is horizontal; the end of the buffer portion 602 away from the connecting portion 601 is provided with a guide portion 603, the vertical projection of the guide portion 603 is an arc, and the arc-shaped opening faces the direction of the mounting seat 2, the guide The maximum rotation diameter of the guide portion 603 rotating along the axis of the mounting seat 2 is smaller than the maximum rotation diameter of the limiting flange 401 rotating along the axis of the mounting seat 2; a pressure block 7 is provided on the upper end surface of each limiting flange 401, and the pressure block 7 includes a mounting portion 701, a deformation portion 702 and a limiting portion 703. The mounting portion 701 is fixedly installed with the slider 4, and the deformation portion 702 is arranged at the upper end of the mounting portion 701. The cross-sections of the mounting portion 701 and the deformation portion 702 are in the shape of a "7". The limiting portion 703 is arranged at the lower end surface of the deformation portion 702. The maximum rotation diameter of the limiting portion 703 rotating along the axis of the mounting seat 2 is larger than the maximum rotation diameter of the guide portion 603 rotating along the axis of the mounting seat 2.

[0035] See also Figure 1 A limiting groove 101 is provided on the upper end surface of the workbench 1, and a dividing motor 12 is slidably installed on the inner side wall of the limiting groove 101. A rubber wheel 13 is coaxially fixedly installed on the output shaft of the dividing motor 12. The side wall of the rubber wheel 13 is rollingly connected to the outer wall of the corrugated pipe workpiece 14 to be welded. A magnetic base 11 is fixedly installed on the side wall of the dividing motor 12, and the magnetic base 11 is magnetically connected to the upper end surface of the workbench 1.

[0036] How it works: See Figures 1 to 6Before welding the two bellows workpieces 14, start the drive motor 8 to rotate counterclockwise, the drive motor 8 drives the No. 1 gear 9 to rotate counterclockwise, the No. 1 gear 9 drives the No. 2 gear 10 to rotate clockwise, and the threaded tube 5 rotates clockwise following the No. 2 gear 10. During the rotation of the threaded tube 5, the axis is displaced upward at the same time, and the conical mating surface and the conical surface section 503 slide relative to each other. At the same time, the conical surface section 503 provides a thrust toward the outside of the mounting seat 2 to the multiple sliders 4. Under the thrust of the conical surface section 503, the sliders 4 slide in the slide groove 202 and move toward the mounting seat 2. The outer side of the seat 2 moves, and the length of the slider 4 extending out of the mounting seat 2 increases until the inner ring of the bellows workpiece 14 overlaps the upper end surface of the limiting flange 401, then the driving motor 8 is stopped, and the two bellows workpieces 14 to be welded are placed on the upper end surface of the limiting flange 401 in the order of arrangement; at this time, due to the gravity of the bellows workpiece 14 on the upper side, the two bellows workpieces 14 fit together, and the bellows workpiece 14 on the lower side fits the upper end surface of the limiting flange 401; continue to start the driving motor 8 to rotate counterclockwise, and the threaded tube 5 continues to rotate clockwise The threaded tube 5 continues to move upward, and the slider 4 continues to move toward the outside of the mounting seat 2 under the driving force of the conical section 503. The length of the slider 4 extending out of the mounting seat 2 increases until the guide portion 603 abuts against the inner wall of the bellows workpiece 14, and the buffer portion 602 is deformed, and the torque of the drive motor 8 increases. After the torque of the drive motor 8 reaches the set value, the drive motor 8 stops rotating and stops. During the process, the limit plate first abuts against the inner wall of the bellows workpiece 14, and as the slider 4 continues to slide toward the outside of the mounting seat 2, the pressure on the limit plate increases. , the limit plate tilts, the deformation portion 702 bends at the position connected to the mounting portion 701, and the end of the deformation portion 702 away from the mounting portion 701 moves downward until the end of the deformation portion 702 away from the mounting portion 701 abuts against the upper end surface of the upper bellows workpiece 14, and the deformation portion 702 presses the upper bellows workpiece 14 downward; at the same time, when the slider 4 moves toward the outside of the mounting seat 2, the pressure spring 15 is gradually compressed, and the elastic potential energy of the pressure spring 15 gradually increases; thereby completing the coaxial positioning of the bellows workpiece 14 and the mounting seat 2.By adjusting the No. 1 rocker arm 304 and the No. 2 rocker arm 305, the head of the welding gun 306 is aligned with the unwelded weld, the No. 1 rocker arm 304 and the No. 2 rocker arm 305 are locked, the laser generator 301 is started, and the output of the laser generator 301 is transmitted to the welding gun 306 through the cable 303. The welding gun 306 emits a laser beam, and the motor arranged in the laser generator 301 drives the column 302 to rotate, and welds the unwelded weld. Segmented welding is adopted, and the area between multiple sliders 4 is welded first. After the segmented welding is completed, the rotation drive of the column 302 is stopped, and the indexing motor 12 is started. The indexing motor 12 drives the rubber wheel 13 to rotate, and the rubber wheel 13 drives the lower corrugated pipe workpiece 14 to rotate until the unwelded weld and the welded weld are exchanged. The indexing motor 12 is stopped and Lock; start the rotation drive of the column 302, and the welding gun 306 welds the inner walls of the two bellows workpieces 14 in sections until the inner walls of the two bellows workpieces 14 form a complete inner ring weld, completing the welding, turn off the rotation drive of the column 302, and then turn off the laser welding generator, start the drive motor 8 to rotate clockwise, and the drive motor 8 drives the No. 1 gear 9 to rotate clockwise, and the No. 1 gear 9 drives the No. 2 gear 10 to rotate counterclockwise, and the threaded tube 5 follows the No. 2 gear 10 to rotate counterclockwise. During the rotation of the threaded tube 5, the axis is displaced downward at the same time, and the elastic potential energy of the pressure spring 15 is released. The slider 4 slides toward the inside of the mounting seat 2 under the pressure of the pressure spring 15, and the reed 6 and the pressure block 7 are reset until the limit flange 401 is completely disengaged from the bellows workpiece 14, completing the reset of the slider 4.

[0037] A specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiment described above. For those skilled in the art, various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A laser tracking and positioning device for bellows girth welding, comprising a workbench (1) and a laser welding assembly (3), wherein the laser welding assembly (3) is fixedly mounted on the lower side of the workbench (1), and is characterized in that: The laser welding assembly (3) includes a column (302) and a welding gun (306), wherein the column (302) is coaxially rotatably mounted on the center of the top surface of the workbench (1), and the two ends of the column (302) extend to the upper and lower sides of the workbench (1) respectively, and the welding gun (306) is hinged on the upper end surface of the column (302), and a mounting seat (2) is coaxially fixedly mounted on the top center of the workbench (1), and a plurality of slide grooves (202) are provided on the side wall of the mounting seat (2), and a slider (4) is slidably mounted in each of the plurality of slide grooves (202), and the ends of the plurality of sliders (4) away from the center of the mounting seat (2) extend to the outside of the mounting seat (2), and the ends of the sliders (4) extending to the outside of the mounting seat (2) are provided with a limiting flange (401), and the lower end surface of the limiting flange (401) is flush with the lower end surface of the slider (4), and the limiting flange (401) is provided on the upper end surface of the slider (4). The thickness of the flange (401) is smaller than that of the slider (4); one end of each of the plurality of sliders (4) provided with the limiting flange (401) is provided with a spring (6) with a horizontal deformation direction; the spring (6) comprises a connecting portion (601); the connecting portion (601) is fixedly mounted on the slider (4); both ends of the connecting portion (601) are provided with a buffer portion (602); both buffer portions (602) extend outside the slider (4); a vertical projection of the connecting portion (601) is in the shape of an arc with an opening facing away from the mounting seat (2); a guide portion (603) is provided at one end of the buffer portion (602) away from the connecting portion (601); a vertical projection of the guide portion (603) is in the shape of an arc with an opening facing the mounting seat (2); a driving assembly is provided in the mounting seat (2); the driving assembly is used for synchronously driving the plurality of sliders (4) to extend to a length outside the mounting seat (2); The driving assembly comprises a threaded tube (5), a driving motor (8), a first gear (9) and a second gear (10), wherein the threaded tube (5) comprises a mounting section (501), a threaded section (502) and a conical section (503) from bottom to top, and a threaded hole (201) is coaxially provided on the mounting seat (2) and passes through the upper and lower ends, and the threaded section (502) is threadedly connected to the threaded hole (201), the driving motor (8) is fixedly mounted on the lower side of the workbench (1), and the first gear (9) is coaxially fixedly mounted on the On the output shaft of the driving motor (8), the mounting section (501) extends to the lower side of the workbench (1), the second gear (10) is coaxially fixedly connected to the mounting section (501), the first gear (9) and the second gear (10) are meshed with each other, the outer wall of the conical section (503) is in the shape of a cone with the small end on top, and a plurality of the sliders (4) are provided with a conical mating surface on one end of the mounting seat (2), and the plurality of the conical mating surfaces have the same taper as the conical section (503), and are all magnetically connected or slidingly connected; A pressing block (7) is provided on the upper end surface of each of the limiting flanges (401), and the pressing block (7) includes a mounting portion (701), a deformation portion (702), and a limiting portion (703). The mounting portion (701) is fixedly mounted on the slider (4), and the deformation portion (702) is provided at the upper end of the mounting portion (701). The cross-sections of the mounting portion (701) and the deformation portion (702) are in the shape of a letter "7". The limiting portion (703) is provided at the lower end surface of the deformation portion (702). The maximum rotation diameter of the limiting portion (703) when rotating along the axis of the mounting seat (2) is greater than the maximum rotation diameter of the guide portion (603) when rotating along the axis of the mounting seat (2). A mounting groove (203) is provided on the bottom wall of the slide groove (202), and the mounting groove (203) has the same path direction as the slide groove (202). A limit block (402) is provided on the lower end surface of the slider (4), and the limit block (402) extends into the mounting groove (203). A pressure spring (15) is provided in the mounting groove (203), and two ends of the pressure spring (15) are respectively fixedly connected to the inner side wall of the mounting groove (203) away from the threaded tube (5) and the limit block (402).

2. The laser tracking and positioning device for bellows girth welding according to claim 1, characterized in that: A limiting groove (101) is provided on the upper end surface of the workbench (1), and a dividing motor (12) is slidably mounted on the inner side wall of the limiting groove (101). A rubber wheel (13) is coaxially fixedly mounted on the output shaft of the dividing motor (12), and the side wall of the rubber wheel (13) is rollingly connected to the outer side wall of the corrugated pipe workpiece (14) to be welded. A magnetic base (11) is fixedly mounted on the side wall of the dividing motor (12), and the magnetic base (11) is magnetically connected to the upper end surface of the workbench (1).

3. The laser tracking and positioning device for bellows girth welding according to claim 2, characterized in that: A plurality of arc-shaped protrusions are provided on the upper end surface of the limiting flange (401), and the arc-shaped protrusions are slidably connected to the bellows workpiece (14) to be welded.

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