Laser tracking and positioning device for corrugated pipe girth welding

Abstract

The invention relates to the technical field of laser welding, in particular to a laser tracking and positioning device for corrugated pipe girth welding, which comprises a workbench and a laser welding assembly, the laser welding assembly comprises a stand column and a welding gun, the stand column is coaxially and rotatably mounted at the center of the top surface of the workbench, and two ends of the stand column extend to the upper side and the lower side of the workbench respectively; the welding gun is hinged to the upper end face of the stand column, and a mounting base is coaxially and fixedly mounted in the center of the top end of the workbench. Through the arrangement of the sliding block and the limiting flange, the length of the part, extending out of the mounting base, of the sliding block is changed till coaxial positioning of the two corrugated pipe workpieces and the mounting base is completed; due to the fact that the welding track of the welding gun and the installation base are coaxial circles, the coaxiality between the welding track of the head of the welding gun and the inner side wall of the corrugated pipe workpiece is guaranteed, and therefore it is guaranteed that the radial distances from any position, in the welding track, of the head of the welding gun to the inner side wall of the corrugated pipe workpiece are the same; and the welding quality of inner side welding seams of the two corrugated pipe workpieces is ensured.

Description

Technical Field

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

[0002] The welded bellows is formed by stacking bellows workpieces or diaphragms layer by layer through welding. Compared with conventional bellows manufactured by integral hydraulic forming or mechanical expansion, the welded bellows is a multi-layer thin-wall structure connected by multiple independent circumferential welds, with higher pressure-bearing capacity, longer fatigue life and stronger rigidity. It is often used in high-strength, high-pressure, high-temperature and precision-sealed pipeline systems such as semiconductor production equipment, aerospace vehicles, nuclear power industry and petrochemical equipment.

[0003] When welding and forming the welded bellows, the circumferential welds are divided into inner circumferential welds and outer circumferential welds. When welding the inner circumferential welds, most of the existing tooling fixtures use outer diameter positioning and clamping. However, the wall thickness of the bellows workpiece is relatively thin, usually 0.1 - 0.5 mm. During the welding process, it is easily affected by heat deformation and distorted. Moreover, conventional contact positioning is likely to cause stress concentration, resulting in the inner wall of the bellows workpiece being elliptical. The error of roundness will reduce the coaxiality of the inner walls of two bellows workpieces, thus making it impossible to guarantee the welding quality. At the same time, ensuring that the laser beam of the laser welding head is at the optimal welding position of two bellows workpieces during welding leads to the inability to guarantee the weld quality. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A laser tracking and positioning device for circumferential seam welding of bellows, comprising a workbench and a laser welding assembly. Specifically, the laser welding assembly includes a laser generator, a column, a cable, a first swing arm, a second swing arm and a welding torch. The laser generator is fixedly installed on the bottom surface of the workbench. The column is rotatably installed on the laser generator, and the upper end of the column extends to the upper end surface of the workbench. The first swing arm is hingedly installed on the upper end surface of the column, and the degree of freedom direction of the first swing arm is horizontal. The second swing arm is hingedly installed on the other end of the first swing arm, and the degree of freedom direction of the second swing arm is vertical. The welding torch is fixedly installed on the other end of the second swing arm. The two ends of the cable are respectively connected to the laser generator and the welding torch. The column is of a hollow structure, and the cable passes through the column. Specifically, a mounting seat is coaxially and fixedly installed at the center of the top end of the workbench. A plurality of sliding grooves are formed in the side wall of the mounting seat. Sliding blocks are slidably installed in the plurality of sliding grooves. One ends of the plurality of sliding blocks away from the center of the mounting seat all extend outside the mounting seat. Limiting flanges are arranged at the ends of the sliding blocks extending outside the mounting seat. The lower end surface of the limiting flange is flush with the lower end surface of the sliding block, and the thickness of the limiting flange is smaller than that of the sliding block. A driving assembly is arranged in the mounting seat, and the driving assembly is used to synchronously drive the lengths of the plurality of sliding blocks extending outside the mounting seat.

[0006] Through the arrangement of the sliding blocks and the limiting flanges, before welding two bellows workpieces, the driving assembly is used to drive the lengths of the sliding blocks extending outside the mounting seat until the inner ring of the bellows workpiece is lapped on the limiting flanges, then stop the driving assembly, and place the two bellows workpieces to be welded on the upper end surfaces of the limiting flanges in the arranged order. At this time, due to the gravity of the upper bellows workpiece, the two bellows workpieces are mutually attached, and the lower bellows workpiece is attached to the upper end surface of the limiting flange. Restart the driving assembly, and the lengths of the sliding blocks extending outside the mounting seat increase until one ends of the plurality of sliding blocks away from the mounting seat are all abutted against the inner side walls of the bellows workpieces, completing the coaxial positioning of the two bellows workpieces and the mounting seat. Since the welding track of the welding torch and the mounting seat are coaxial circles, the coaxiality between the welding track of the head of the welding torch and the inner side wall of the bellows workpiece is ensured. Therefore, the radial distance from any point on the welding track of the head of the welding torch to the inner side wall of the bellows workpiece is the same, ensuring the welding quality of the inner side welds of the two bellows workpieces. At the same time, the coaxial positioning between the two bellows workpieces and the mounting seat uses the inner side walls of the bellows workpieces for positioning, and the number of positioning points is multiple, avoiding the problem that the bellows workpieces are distorted due to uneven force, resulting in the actual centers of the two bellows workpieces being non-concentric with the mounting seat, ensuring the coaxiality between the welding track of the head of the welding torch and the inner side wall of the bellows workpiece, and thus ensuring the welding quality of the inner side welds of the two bellows workpieces.

[0007] Preferably, the driving assembly includes a threaded pipe, a driving motor, a first gear and a second gear. The threaded pipe includes an installation section, a threaded section and a conical surface section from bottom to top. A threaded hole penetrating through the upper and lower ends is coaxially formed in the mounting seat. The threaded section is threadedly connected to the threaded hole. The driving motor is fixedly installed on the lower side of the workbench. The first gear is coaxially fixedly installed on the output shaft of the driving motor. The installation section extends to the lower side of the workbench. The second gear is coaxially fixedly connected to the installation section. The first gear meshes with the second gear. The outer sidewall of the conical surface section is in the shape of a frustum with the small end facing up. One ends of a plurality of the sliders provided in the mounting seat are provided with conical mating surfaces. The plurality of conical mating surfaces have the same taper as the conical surface section and are both magnetically connected and slidably connected.

[0008] The driving motor drives the first gear to rotate. The first gear drives the second gear to rotate. The threaded pipe rotates following the second gear. When the threaded pipe rotates, it moves up or down in the threaded hole. And the slider is slidably connected and magnetically connected to the conical surface section of the threaded pipe. When the threaded pipe moves up, it pushes the slider to move towards the outside of the mounting seat, and the length of the slider extending out of the mounting seat increases. When the threaded pipe moves down, the slider moves towards 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. Thus, the control of the length of the slider extending out of the mounting seat is completed. By adopting the threaded driving method, compared with hydraulic driving and gas driving, the stroke and driving force of the threaded driving are better controlled, and there is no impact load in the threaded driving, avoiding the problem that the slider impacts the inner sidewall of the bellows workpiece, causing deformation or damage to the bellows workpiece, so as to ensure the roundness of the inner sidewall of the bellows workpiece and the workpiece quality, and thus ensure the welding quality of the inner welds of the two bellows workpieces.

[0009] Preferably, one ends of the plurality of sliders provided with limiting flanges are all provided with reed pieces. The reed pieces include a connecting portion and a buffering portion. The connecting portion is fixedly installed with the slider. The number of buffering portions of each reed piece is 2 and are respectively symmetrically arranged at both ends of the connecting portion. Both of the two buffering portions extend outside the slider. The vertical projection of the connecting portion and the reed piece is arc-shaped, and the opening of the arc faces away from the mounting seat. The free deformation direction of the buffering portion is the horizontal direction.

[0010] By providing a reed with an arc shape at the end of the slider, when the slider extends outside the mounting seat to align with the inner side wall of the metal ring, the end of the buffer part far from the connecting part first abuts against the inner side wall of the metal ring, and the buffer part is deformable, thereby reducing the impact force between the connecting part and the metal ring, avoiding the impact on the inner side wall of the bellows workpiece, and preventing the bellows workpiece from deforming or being damaged, thus ensuring the roundness of the inner side wall of the bellows workpiece and the workpiece quality, and further ensuring the welding quality of the inner side welds of the two bellows workpieces. And through the setting of the reed, each contact between the reed and the inner side wall of the bellows workpiece is at two points, further dispersing the clamping force applied to the inner side wall of the bellows workpiece, avoiding the problem of the bellows workpiece being distorted and deformed due to the concentration of the clamping force, and at the same time, multi-point positioning further ensures the coaxiality between the metal ring and the mounting seat, thus ensuring the welding quality of the inner side welds of the two bellows workpieces.

[0011] Preferably, a guiding part is provided at the end of the buffer part far from the connecting part. The vertical projection of the guiding part is arc-shaped, and the opening of the arc faces the direction of the mounting seat. The maximum turning diameter of the guiding part rotating along the axis of the mounting seat is smaller than the maximum turning diameter of the limiting flange rotating along the axis of the mounting seat.

[0012] To avoid the thermal deformation of the two bellows workpieces during the welding process, segmental welding is usually used to weld the two bellows workpieces. Therefore, when welding the inner side walls of the two bellows workpieces, first weld the area between multiple sliders. After the segmental welding is completed, then rotate the bellows workpiece to rotate the unwelded area to between the sliders, and continue to use the segmental welding method to weld the unwelded area until a complete circumferential weld is formed; since there are already welded welds on the inner side walls of the two bellows workpieces after the first segmental welding, and there is a deviation in the inner diameter dimensions between the already welded welds and the unwelded welds, through the setting of the guiding part, when rotating the bellows workpiece, the arc-shaped setting of the guiding part can more smoothly transition from the unwelded weld to the already welded weld, avoiding the problem of the bellows workpiece getting stuck during rotation and causing the bellows workpiece to be distorted and deformed under the action of the torque force, ensuring the coaxiality between the metal ring and the mounting seat, and thus ensuring the welding quality of the inner side welds of the two bellows workpieces.

[0013] Preferably, a pressing block is provided on the upper end surface of each limiting flange. The pressing block includes a mounting part, a deformable part, and a limiting part. The mounting part is fixedly installed with the slider. The deformable part is arranged at the upper end of the mounting part. The cross-section of the mounting part and the deformable part is in a "7" shape. The limiting part is arranged on the lower end surface of the deformable part. The maximum turning diameter of the limiting part rotating along the axis of the mounting seat is larger than the maximum turning diameter of the guiding part rotating along the axis of the mounting seat.

[0014] By arranging a pressing block on the limiting flange, when the slider extends out of the mounting seat and centers on the inner side wall of the metal ring, the limiting plate first abuts against the inner side wall of the bellows workpiece. As the slider continues to slide out of the mounting seat, the pressure received by the limiting plate increases, and the limiting plate tilts. According to the lever principle, the deformation part deflects at the position connected to the mounting part, and the end of the deformation part far from the mounting part displaces downward until the end of the deformation part far from the mounting part abuts against the upper end face of the upper bellows workpiece. The deformation part presses the upper bellows workpiece downward to ensure the fitting degree between the two bellows workpieces, thereby ensuring the welding quality of the weld seam.

[0015] Preferably, an installation groove is formed in the bottom wall of the sliding groove. The installation groove has the same path direction as the sliding groove. A limiting block is arranged on the lower end face of the slider. The limiting block extends into the installation groove. A pressure spring is arranged in the installation groove. Two ends of the pressure spring are respectively fixedly connected to the inner side wall of one end of the installation groove far from the threaded pipe and the limiting block.

[0016] Through the arrangement of 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 extending speed of the slider, reducing the impact force between the reed and the metal ring, avoiding the impact on the inner side wall of the bellows workpiece, and preventing the problem of deformation or damage of the bellows workpiece, thereby ensuring the roundness of the inner side wall of the bellows workpiece and the workpiece quality, and thus ensuring the welding quality of the inner weld seam of the two bellows workpieces. At the same time, when the threaded pipe moves downward, the pressure spring releases the spring force and pushes the slider to move into the mounting seat, avoiding the problem that the friction force between the slider and the sliding groove is too large and the magnetic suction force between the conical surface section and the slider is insufficient, resulting in the slider being unable to be recycled, thereby ensuring the normal movement of the equipment.

[0017] Preferably, a limiting groove is formed in the upper end face of the workbench. A indexing motor is slidably installed on the inner side wall of the limiting groove. A rubber wheel is coaxially and fixedly installed on the output shaft of the indexing motor. The side wall of the rubber wheel is in rolling connection with the outer side wall of the bellows workpiece to be welded. A magnetic suction base is fixedly installed on the side wall of the indexing motor. The magnetic suction base is magnetically connected to the upper end face of the workbench.

[0018] Through the setting of 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 bellows workpiece to rotate, so as to realize the transfer of the positions of the welded weld and the unwelded weld, improving the automation of the equipment; by setting a limiting groove on the workbench and locking the indexing motor and the workbench through the magnetic suction base at the same time, stepless adjustment of the position of the indexing motor can be achieved, avoiding the problem of the outer side of the bellows workpiece being distorted due to excessive pressure between the rubber wheel and the bellows workpiece, so as to ensure the dimensional accuracy of the bellows workpiece after the inner ring weld is completed.

[0019] Preferably, a plurality of arc-shaped protrusions are provided on the upper end surface of the limiting flange, and the arc-shaped protrusions are slidably connected to the bellows workpiece to be welded. Since the deformation part applies a downward pressure to the upper bellows workpiece, and the contact between the limiting flange and the lower bellows workpiece is a surface contact, when the rubber wheel drives the bellows workpiece to rotate, it is easy to cause excessive friction between the lower bellows workpiece and the limiting flange, resulting in the problem that the rubber wheel cannot drive the bellows workpiece to rotate or the rotation angle deviates; for this reason, by providing a plurality of arc-shaped protrusions on the limiting flange, the contact area between the lower bellows workpiece and the limiting flange is reduced, thereby reducing the friction between the lower bellows workpiece and the limiting flange, so as to ensure that the rotation angle of the bellows workpiece does not deviate, and thus ensure the welding quality of the inner ring weld.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the setting of the slider and the limiting flange, the length of the slider extending out of the mounting seat is driven by the driving component until the coaxial positioning of the two bellows workpieces and the mounting seat is completed; since the welding track of the welding torch is a coaxial circle with the mounting seat, the coaxiality between the welding track of the head of the welding torch and the inner side wall of the bellows workpiece is ensured. For this reason, it is ensured that the radial distance from any point on the welding track of the head of the welding torch to the inner side wall of the bellows workpiece is the same, and the welding quality of the inner side welds of the two bellows workpieces is ensured.

[0021] 2. By providing an arc-shaped reed at the end of the slider, the buffer part of the reed reduces the impact force between the connecting part and the metal ring, ensuring the roundness of the inner side wall of the bellows workpiece; and the contact between the reed and the inner side wall of the bellows workpiece is all at two points, further dispersing the clamping force applied to the inner side wall of the bellows workpiece, avoiding the problem of the bellows workpiece being distorted due to the concentration of the clamping force, and at the same time, multi-point positioning further ensures the coaxiality between the metal ring and the mounting seat, so as to ensure the welding quality of the inner side welds of the two bellows workpieces.

[0022] 3. In the present invention, by providing a pressing block on the limiting flange, when the slider extends out of the mounting seat and centers on the inner side wall of the metal ring, the limiting plate abuts against the inner side wall of the bellows workpiece and transfers the pressure to the deformation part. The pressure on the deformation part acts on the upper end surface of the upper bellows workpiece, and 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 seam. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of a laser tracking and positioning device for circumferential seam welding of bellows according to the present invention; Figure 2 is a top view of a laser tracking and positioning device for circumferential seam welding of bellows according to the present invention; Figure 3 is Figure 2 a full cross-sectional view taken along line A-A in Figure 4 is Figure 2 a full cross-sectional view taken along line B-B in Figure 5 is Figure 3 an enlarged view of C in Figure 6 is an exploded view of the slider in a laser tracking and positioning device for circumferential seam welding of bellows according to the present invention.

[0024] In the figure: 1, workbench; 101, limiting groove; 2, mounting seat; 201, threaded hole; 202, sliding groove; 203, mounting groove; 3, laser welding assembly; 301, laser generator; 302, column; 303, cable; 304, first swing arm; 305, second swing arm; 306, welding torch; 4, slider; 401, limiting flange; 402, limiting block; 5, threaded pipe; 501, mounting section; 502, threaded section; 503, tapered section; 6, reed; 601, connecting part; 602, buffer part; 603, guiding part; 7, pressing block; 701, mounting part; 702, deformation part; 703, limiting part; 8, driving motor; 9, first gear; 10, second gear; 11, magnetic suction base; 12, indexing motor; 13, rubber wheel; 14, bellows workpiece; 15, pressure spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Please refer to Figures 1 to 6 , the present invention provides a laser tracking and positioning device for circumferential seam welding of bellows, and the technical solution is as follows: A laser tracking and positioning device for circumferential seam welding of bellows, please refer to 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 first swing arm 304, a second swing arm 305, and a welding torch 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 first swing arm 304 is hinged and installed on the upper end surface of the column 302, and the degree of freedom direction of the first swing arm 304 is horizontal. The second swing arm 305 is hinged and installed at the other end of the first swing arm 304, and the degree of freedom direction of the second swing arm 305 is vertical. The welding torch 306 is fixedly installed at the other end of the second swing arm 305. The two ends of the cable 303 are respectively connected to the laser generator 301 and the welding torch 306. The column 302 is a hollow structure, and the cable 303 passes through the column 302. Specifically, a mounting seat 2 is coaxially and fixedly installed at the center of the top end of the workbench 1. A plurality of sliding grooves 202 are formed on the side wall of the mounting seat 2. A slider 4 is slidably installed in each of the plurality of sliding grooves 202. One end of each of the plurality of sliders 4 away from the center of the mounting seat 2 extends outside the mounting seat 2. An installation groove 203 is formed on the bottom wall of the sliding groove 202. The installation groove 203 has the same path direction as the sliding groove 202. A limiting block 402 is provided on the lower end surface of the slider 4. The limiting block 402 extends into the installation groove 203. A compression spring 15 is provided in the installation groove 203. The two ends of the compression spring 15 are respectively fixedly connected to the inner side wall of the end of the installation groove 203 away from the threaded pipe 5 and the limiting block 402. A limiting flange 401 is provided at one end of each of the sliders 4 extending outside the mounting seat 2. The lower end surface of the limiting flange 401 is flush with the lower end surface of the slider 4, and the thickness of the limiting flange 401 is smaller than the thickness of the slider 4. A plurality of arc-shaped protrusions are provided on the upper end surface of the limiting flange 401. The arc-shaped protrusions are slidably connected to the bellows workpiece 14 to be welded. A driving assembly is provided in the mounting seat 2. The driving assembly includes a threaded pipe 5, a driving motor 8, a first gear 9, and a second gear 10. The threaded pipe 5 includes an installation section 501, a threaded section 502, and a conical section 503 from bottom to top. A threaded hole 201 penetrating the upper and lower ends is coaxially formed on the mounting seat 2. The threaded section 502 is threadedly connected to the threaded hole 201. The driving motor 8 is fixedly installed on the lower side of the workbench 1. The driving motor 8 needs to be a motor with a parking function. The first gear 9 is coaxially and fixedly installed on the output shaft of the driving motor 8. The installation section 501 extends to the lower side of the workbench 1. The second gear 10 is coaxially and fixedly connected to the installation section 501. The first gear 9 and the second gear 10 are meshed with each other. The outer side wall of the conical section 503 is in the shape of a frustum with the small end on the upper side. A conical mating surface is provided at one end of each of the plurality of sliders 4 provided in the mounting seat 2. The conical mating surfaces have the same taper as the conical section 503 and are both magnetically connected and slidably connected.

[0026] Please refer to Figure 5 and Figure 6, one end of each of the plurality of sliders 4 provided with a limiting flange 401 is provided with a reed 6. The reed 6 includes a connecting portion 601 and a buffer portion 602. The connecting portion 601 is fixedly installed with the slider 4. The number of buffer portions 602 of each reed 6 is 2, and they are symmetrically arranged at both ends of the connecting portion 601 respectively. Both buffer portions 602 extend outside the slider 4. The vertical projection of the connecting portion 601 and the reed 6 is arc-shaped, and the opening of the arc faces away from the mounting base 2. The free deformation direction of the buffer portion 602 is the horizontal direction; one end of the buffer portion 602 away from the connecting portion 601 is provided with a guiding portion 603. The vertical projection of the guiding portion 603 is arc-shaped, and the opening of the arc faces the direction of the mounting base 2. The maximum turning diameter of the guiding portion 603 rotating along the axis of the mounting base 2 is smaller than the maximum turning diameter of the limiting flange 401 rotating along the axis of the mounting base 2; a pressing block 7 is provided on the upper end surface of each limiting flange 401. The pressing 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. The deformation portion 702 is arranged at the upper end of the mounting portion 701. The cross section of the mounting portion 701 and the deformation portion 702 is in the shape of "7". The limiting portion 703 is arranged on the lower end surface of the deformation portion 702. The maximum turning diameter of the limiting portion 703 rotating along the axis of the mounting base 2 is larger than the maximum turning diameter of the guiding portion 603 rotating along the axis of the mounting base 2.

[0027] Please refer to Figure 1 , a limiting groove 101 is opened on the upper end surface of the workbench 1. A indexing motor 12 is slidably installed on the inner side wall of the limiting groove 101. A rubber wheel 13 is coaxially and fixedly installed on the output shaft of the indexing motor 12. The side wall of the rubber wheel 13 is in rolling connection with the outer side wall of the bellows workpiece 14 to be welded. A magnetic attraction base 11 is fixedly installed on the side wall of the indexing motor 12. The magnetic attraction base 11 is magnetically connected to the upper end surface of the workbench 1.

[0028] Working principle: Please refer to Figures 1 to 6; Before welding two corrugated pipe workpieces 14, start the driving motor 8 to rotate counterclockwise. The driving motor 8 drives the first gear 9 to rotate counterclockwise, and the first gear 9 drives the second gear 10 to rotate clockwise. The threaded pipe 5 rotates clockwise following the second gear 10. During the rotation of the threaded pipe 5, it simultaneously moves upward along the axis. The conical mating surface and the conical surface section 503 undergo relative sliding. At the same time, the conical surface section 503 provides a thrust towards the outside of the mounting seat 2 to multiple sliders 4. The sliders 4 slide in the sliding groove 202 under the pushing force of the conical surface section 503 and move towards the outside of the mounting seat 2. The length of the sliders 4 extending outside the mounting seat 2 increases. After the inner ring of the corrugated pipe workpiece 14 is lapped onto the upper end surface of the limit flange 401, stop the driving motor 8, and place the two corrugated pipe workpieces 14 to be welded on the upper end surface of the limit flange 401 in the arranged order; at this time, due to the gravity of the upper corrugated pipe workpiece 14, the two corrugated pipe workpieces 14 are in contact with each other, and the lower corrugated pipe workpiece 14 is in contact with the upper end surface of the limit flange 401; continue to start the driving motor 8 to rotate counterclockwise, the threaded pipe 5 continues to rotate clockwise, and at the same time the threaded pipe 5 continues to move upward. The sliders 4 continue to move towards the outside of the mounting seat 2 under the pushing force of the conical surface section 503, and the length of the sliders 4 extending outside the mounting seat 2 increases until the guiding portion 603 abuts against the inner side wall of the corrugated pipe workpiece 14 and the buffer portion 602 deforms. The torque of the driving motor 8 increases until the torque of the driving motor 8 reaches the set value, then the driving motor 8 stops rotating and shuts down; during this process, the limiting plate first abuts against the inner side wall of the corrugated pipe workpiece 14. As the sliders 4 continue to slide outside the mounting seat 2, the pressure on the limiting plate increases, the limiting plate tilts, the deformation portion 702 deflects 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 corrugated pipe workpiece 14, and the deformation portion 702 presses the upper corrugated pipe workpiece 14 downward; at the same time, when the sliders 4 move towards the outside of the mounting seat 2, the compression spring 15 is gradually compressed, and the elastic potential energy of the compression spring 15 gradually increases; thus, the coaxial positioning of the corrugated pipe workpiece 14 and the mounting seat 2 is completed.By adjusting the first rocker arm 304 and the second rocker arm 305, align the head of the welding torch 306 with the unwelded weld seam, lock the first rocker arm 304 and the second rocker arm 305, start the laser generator 301, the output of the laser generator 301 is transmitted into the welding torch 306 through the cable 303, the welding torch 306 emits a laser beam, drive the column 302 to rotate by the motor arranged in the laser generator 301, and weld the unwelded weld seam. Adopt segmented welding, first weld the area between multiple sliders 4. After the segmented welding is completed, stop the rotational drive of the column 302, start the indexing motor 12, the indexing motor 12 drives the rubber wheel 13 to rotate, the rubber wheel 13 drives the bellows workpiece 14 on the lower side to rotate, until the unwelded weld seam and the welded weld seam complete the position exchange, then stop the indexing motor 12 and lock it; start the rotational drive of the column 302, and the welding torch 306 welds the inner side walls of the two bellows workpieces 14 in segments until the inner side walls of the two bellows workpieces 14 form a complete inner ring weld seam to complete the welding. Turn off the rotational drive of the column 302, turn off the laser welding generator, start the drive motor 8 to rotate clockwise, the drive motor 8 drives the first gear 9 to rotate clockwise, the first gear 9 drives the second gear 10 to rotate counterclockwise, the threaded tube 5 rotates counterclockwise following the second gear 10, and the threaded tube 5 moves axially downward while rotating. The elastic potential energy of the compression spring 15 is released, and the slider 4 slides inward towards the mounting seat 2 under the pressure of the compression spring 15, and the reed 6 and the pressing block 7 are reset until the limit flange 401 is completely separated from the bellows workpiece 14 to complete the reset of the slider 4.

[0029] The above has described in detail a specific embodiment of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above-described embodiment. For those skilled in the art, without departing from the principles and ideas of the present invention, various changes, modifications, substitutions, and variations made to these embodiments should still fall within the protection scope of the present invention.

Claims

1. A laser tracking and positioning device for circumferential welding of corrugated pipes, comprising a workbench (1) and a laser welding assembly (3), wherein the laser welding assembly (3) is fixedly installed 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 torch (306). The column (302) is coaxially and rotatably installed at the center of the top surface of the workbench (1), and both ends of the column (302) extend to the upper and lower sides of the workbench (1) respectively. The welding torch (306) is hinged on the upper end surface of the column (302). A mounting seat (2) is coaxially and fixedly installed at the center of the top end of the workbench (1). A plurality of sliding grooves (202) are formed in the side wall of the mounting seat (2). Sliders (4) are slidably installed in the plurality of sliding grooves (202). One end of each of the plurality of sliders (4) away from the center of the mounting seat (2) extends outside the mounting seat (2). A limiting flange (401) is provided at the end of the slider (4) extending outside the mounting seat (2). The lower end surface of the limiting flange (401) is flush with the lower end surface of the slider (4), and the thickness of the limiting flange (401) is smaller than that of the slider (4). A reed (6) with a horizontal deformation direction is provided at one end of each of the plurality of sliders (4) provided with a limiting flange (401). The reed (6) includes a connecting portion (601). The connecting portion (601) is fixedly installed with the slider (4). Buffer portions (602) are provided at both ends of the connecting portion (601). Both of the two buffer portions (602) extend outside the slider (4). The vertical projection of the connecting portion (601) is an arc with an opening facing away from the mounting seat (2). A guiding portion (603) is provided at the end of the buffer portion (602) away from the connecting portion (601). The vertical projection of the guiding portion (603) is 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 to synchronously drive the lengths of the plurality of sliders (4) extending outside the mounting seat (2).

2. The laser tracking and positioning device for circumferential seam welding of corrugated pipes according to claim 1, wherein The driving assembly includes a threaded pipe (5), a driving motor (8), a first gear (9) and a second gear (10). The threaded pipe (5) includes an installation section (501), a threaded section (502) and a conical surface section (503) from bottom to top. A threaded hole (201) penetrating through the upper and lower ends is coaxially formed in the mounting seat (2). The threaded section (502) is threadedly connected with the threaded hole (201). The driving motor (8) is fixedly installed on the lower side of the workbench (1). The first gear (9) is coaxially fixedly installed on the output shaft of the driving motor (8). The installation section (501) extends to the lower side of the workbench (1). The second gear (10) is coaxially fixedly connected with the installation section (501). The first gear (9) and the second gear (10) are meshed with each other. The outer side wall of the conical surface section (503) is in the shape of a frustum of a cone with the small end on the upper side. A conical mating surface is provided at one end of each of the plurality of sliders (4) arranged in the mounting seat (2). The plurality of conical mating surfaces have the same taper as the conical surface section (503) and are both magnetically connected and slidably connected.

3. The laser tracking and positioning device for circumferential welding of corrugated pipes according to claim 1, characterized in that, A pressing block (7) is provided on the upper end surface of each of the limiting flanges (401). The pressing 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). The deformation portion (702) is provided at the upper end of the mounting portion (701). The cross-section of the mounting portion (701) and the deformation portion (702) is in a "7" shape. The limiting portion (703) is provided on the lower end surface of the deformation portion (702). The maximum turning diameter of the limiting portion (703) rotating along the axis of the mounting seat (2) is greater than the maximum turning diameter of the guiding portion (603) rotating along the axis of the mounting seat (2).

4. A laser tracking and positioning device for circumferential welding of corrugated pipes according to claim 2, characterized in that, An installation groove (203) is formed in the bottom wall of the sliding groove (202). The installation groove (203) has the same path direction as the sliding groove (202). A limiting block (402) is provided on the lower end surface of the slider (4). The limiting block (402) extends into the installation groove (203). A pressure spring (15) is provided in the installation groove (203). The two ends of the pressure spring (15) are fixedly connected to the inner side wall of one end of the installation groove (203) away from the threaded pipe (5) and the limiting block (402) respectively.

5. The laser tracking and positioning device for circumferential seam welding of bellows according to claim 3, characterized in that, A limiting groove (101) is formed on the upper end surface of the workbench (1). A indexing motor (12) is slidably installed on the inner side wall of the limiting groove (101). A rubber wheel (13) is coaxially and fixedly installed on the output shaft of the indexing motor (12). The side wall of the rubber wheel (13) is in rolling connection with the outer side wall of the bellows workpiece (14) to be welded. A magnetic suction base (11) is fixedly installed on the side wall of the indexing motor (12). The magnetic suction base (11) is magnetically connected to the upper end surface of the workbench (1).

6. The laser tracking and positioning device for bellows circumferential seam welding according to claim 5, characterized in that, A plurality of arc-shaped protrusions are provided on the upper end surface of the limiting flange (401). The arc-shaped protrusions are in sliding connection with the bellows workpiece (14) to be welded.

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