Positioning-assisted vertical laser welding machine for circular tube

Abstract

The invention relates to the technical field of laser welding, in particular to an auxiliary positioning round tube vertical laser welding machine which comprises a machine table, a supporting frame, a bearing frame and a fixing plate, the supporting frame, the bearing frame and the fixing plate are fixed to the machine table, a welding head is installed on the supporting frame, a translation assembly is arranged on the bearing frame, and a movable plate is connected to the translation assembly; the two-way clamping mechanisms are arranged on the fixed plate and the movable plate respectively, and guide rollers which are symmetrically arranged are connected to the two-way clamping mechanisms; the coaxial positioning mechanism is arranged on the movable plate, and a plurality of positioning plates which are symmetrically arranged and circumferentially distributed at equal intervals are connected to the coaxial positioning mechanism; and the air pumping rotating mechanism is arranged on the movable plate and connected with the coaxial positioning mechanism, and through cooperation of the air pumping rotating mechanism and the coaxial positioning mechanism, the positioning plate can be controlled to execute inner supporting type positioning on the two circular pipes, so that the laser welding precision is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, specifically to a vertical laser welding machine for circular tubes with auxiliary positioning. Background Technology

[0002] Laser welding, as a modern welding process with high energy density, high precision, and high efficiency, is increasingly widely used in the connection of round tube workpieces. Its working principle is to use a high-energy laser beam to instantly melt and fuse the area to be welded, and form a strong weld after cooling.

[0003] When performing laser welding on round tubes, especially when butt welding two sections of round tubes, the two sections of round tubes are usually clamped and fixed by external clamps first. Then, their relative positions are adjusted so that the two ends meet and remain coaxial as much as possible. Finally, the laser welding head is used to perform circumferential scanning welding along the butt joint, or the round tubes are rotated while the welding head is fixed for welding.

[0004] To facilitate the removal of the round tubes after welding, the clamps are usually fixed by external clamping. However, if the clamps themselves are not positioned accurately, the two round tubes will be misaligned, which increases the difficulty of subsequent adjustment and welding. Furthermore, since the round tubes themselves may have manufacturing tolerances such as roundness error, straightness error, or uneven wall thickness, positioning based on the outer circle cannot guarantee that the inner hole axes of the two round tubes are aligned, which will lead to misalignment problems during welding. Summary of the Invention

[0005] The purpose of this invention is to provide a vertical laser welding machine for circular tubes with auxiliary positioning, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A vertical laser welding machine for circular tubes with auxiliary positioning, comprising:

[0008] The machine base, as well as the support frame, the receiving frame and the fixed plate fixed on the machine base, the support frame is equipped with a welding head, the receiving frame is equipped with a translation component, and the translation component is connected to a movable plate;

[0009] Also includes:

[0010] A bidirectional clamping mechanism is respectively disposed on the fixed plate and the movable plate, and guide rollers arranged symmetrically are connected to the bidirectional clamping mechanism;

[0011] A coaxial positioning mechanism is provided on the movable plate, and multiple positioning plates that are symmetrically arranged and circumferentially distributed are connected to the coaxial positioning mechanism.

[0012] A pumping and rotating mechanism is disposed on the movable plate and connected to the coaxial positioning mechanism. The pumping and rotating mechanism can drive the positioning plate to perform opening and rotating actions through the coaxial positioning mechanism.

[0013] As a further embodiment of the present invention: the bidirectional clamping mechanism includes a support plate fixed to the fixed plate and the movable plate respectively, a support sleeve fixed on the support plate, a support rod axially sliding inside the support sleeve, a push plate fixed to the end of the support rod, and symmetrically arranged receiving rods rotatably mounted on the push plate, the receiving rods being fixedly connected to the guide roller.

[0014] As a further embodiment of the present invention: a limiting rod is fixed on the support rod, which penetrates the support plate; a limiting ring is fixed on the limiting rod that abuts against the support plate; a first spring is sleeved on the support sleeve and the support rod; and the two ends of the first spring abut against the support plate and the push plate, respectively.

[0015] As a further embodiment of the present invention: the coaxial positioning mechanism includes a hollow rod rotatably mounted on the movable plate, the outer circumference of the hollow rod having symmetrically arranged sliding grooves, and symmetrically arranged movable sleeves being axially slidably arranged on the hollow rod, with a sealing ring fixed inside the movable sleeve that slidably engages with the sliding grooves and is slidably connected to the hollow rod.

[0016] As a further embodiment of the present invention: a first hinge rod is hinged to the hollow rod, which is symmetrically arranged and equidistantly distributed around the circumference; a second hinge rod is hinged to the outer circumference of the movable sleeve; and the first hinge rod and the second hinge rod are hinged to the positioning plate.

[0017] As a further embodiment of the present invention: the pumping rotation mechanism includes a pumping cylinder fixed to the end of the hollow rod, a piston disc is slidably and sealed inside the pumping cylinder, and a guide column passing through the pumping cylinder is fixed on the piston disc;

[0018] It also includes a follower assembly and a pusher assembly disposed on the movable plate for driving the piston disc movement.

[0019] As a further embodiment of the present invention: the follower component includes a rotating rod fixed on the piston disc, the outer circumferential wall of the rotating rod is formed with a helical groove, a sliding sleeve is axially slidably disposed on the rotating rod, and a limiting block is fixed on the inner wall of the sliding sleeve to slide and engage with the helical groove.

[0020] As a further embodiment of the present invention: the pushing assembly includes a support column and a cylinder fixed on the movable plate, a connecting plate that is axially slidably disposed on the support column and fixedly connected to the sliding sleeve, the telescopic end of the cylinder being fixedly connected to the connecting plate, and a second spring being sleeved on the rotating rod, the two ends of the second spring abutting against the piston disc and the connecting plate respectively.

[0021] As a further embodiment of the present invention: the two sealing rings are combined to form a pressurized cavity for adjusting the distance between the two movable sleeves.

[0022] As a further embodiment of the present invention: the side wall of the pump cylinder is connected to a conduit that passes through one of the sealing rings and is connected to the pressurization cavity.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention automatically changes the pressure in the pressurized cavity through the cooperation of the coaxial positioning mechanism and the air pump rotation mechanism, so that the positioning plate can be smoothly unfolded and the interior of the two round tubes can be internally supported and positioned. In this way, it can be ensured that the inner holes of the two round tubes are a unified reference and the axis of the two round tubes is forced to be aligned with the axis of the hollow rod, fundamentally eliminating the misalignment problem caused by the manufacturing error of the outer circle of the round tubes, and ensuring the uniformity of the butt weld and the welding quality.

[0024] By displacing the connecting plate with a cylinder, the pressure inside the pressurized cavity can be changed to position the round tube via the positioning plate. After positioning, the two round tubes can be automatically controlled to rotate synchronously through the cooperation of the limit block and the spiral groove. This ensures that the welding head can fully weld the welding position and avoids the loss of welding accuracy caused by the switching of other drive sources.

[0025] The air pressure in the pressurized cavity continuously acts on the sealing ring, ensuring that the movable sleeve always maintains a stable axial pressure. This ensures that the force between the positioning plate and the inner wall of the circular tube is sufficient, preventing the circular tube from shifting due to centrifugal force or vibration during rotation. At the same time, because the positioning plate maintains radial stability through the parallelogram mechanism of the first hinge rod, the contact area between it and the tube wall remains constant, effectively avoiding tube wall deformation caused by local stress concentration. Attached Figure Description

[0026] Figure 1 A schematic diagram of one embodiment of a vertical laser welding machine for circular tubes used for auxiliary positioning.

[0027] Figure 2 A schematic diagram of another angle in one embodiment of a vertical laser welding machine for circular tubes used for auxiliary positioning.

[0028] Figure 3A schematic diagram showing the connection relationship between the translation component, bidirectional clamping mechanism, coaxial positioning mechanism, and part of the air pumping and rotating mechanism in one embodiment of a vertical laser welding machine for auxiliary positioning of round tubes.

[0029] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0030] Figure 5 for Figure 3 Another structural diagram from another angle.

[0031] Figure 6 A schematic diagram of the structure of the fixed plate and the bidirectional clamping mechanism in one embodiment of a vertical laser welding machine for circular tubes used for auxiliary positioning.

[0032] Figure 7 A schematic diagram of the structure of a bidirectional clamping mechanism, a partial coaxial positioning mechanism, and a partial air pumping and rotating mechanism in one embodiment of a vertical laser welding machine for assisting positioning of round tubes.

[0033] Figure 8 A schematic diagram of part of the bidirectional clamping mechanism in one embodiment of a vertical laser welding machine for circular tubes used for auxiliary positioning.

[0034] Figure 9 An exploded view of part of the bidirectional clamping mechanism in one embodiment of a vertical laser welding machine for circular tubes used for auxiliary positioning.

[0035] Figure 10 A schematic diagram of the coaxial positioning mechanism and part of the air pump rotation mechanism in one embodiment of a vertical laser welding machine for assisting positioning of round tubes.

[0036] Figure 11 An exploded view of part of the air pump rotation mechanism in one embodiment of a vertical laser welding machine for assisting positioning of circular tubes.

[0037] Figure 12 A schematic cross-sectional view of the pump cylinder, hollow rod, and movable sleeve in one embodiment of a vertical laser welding machine for assisting positioning of circular tubes.

[0038] In the diagram: 1. Machine base; 2. Support frame; 3. Welding head; 4. Receiving frame; 5. Fixing plate; 6. Support plate; 7. Support sleeve; 8. Support rod; 9. First spring; 10. Push plate; 11. Receiving rod; 12. Guide roller; 13. Limiting rod; 1301. Limiting ring; 14. Movable plate; 15. Hollow rod; 1501. Slide groove; 16. Movable sleeve; 1601. Sealing ring; 17. First hinge rod; 18. Second hinge rod; 19. Positioning plate; 20. Pump cylinder; 21. Guide tube; 22. Piston disc; 23. Guide column; 24. Rotating rod; 2401. Spiral groove; 25. Sliding sleeve; 2501. Limiting block; 26. Connecting plate; 27. Second spring; 28. Support column; 29. ​​Cylinder. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] Please see Figures 1-12 In this embodiment of the invention, a vertical laser welding machine for circular tubes with auxiliary positioning includes:

[0042] The machine base 1, as well as the support frame 2, the receiving frame 4 and the fixing plate 5 fixed on the machine base 1, the support frame 2 is equipped with a welding head 3, the receiving frame 4 is equipped with a translation component, and the translation component is connected to a movable plate 14.

[0043] Also includes:

[0044] A bidirectional clamping mechanism is respectively disposed on the fixed plate 5 and the movable plate 14, and guide rollers 12 arranged symmetrically are connected to the bidirectional clamping mechanism;

[0045] A coaxial positioning mechanism is provided on the movable plate 14, and a plurality of positioning plates 19 are connected to the coaxial positioning mechanism in a symmetrical arrangement and circumferentially distributed.

[0046] A pumping and rotating mechanism is disposed on the movable plate 14 and connected to the coaxial positioning mechanism. The pumping and rotating mechanism can drive the positioning plate 19 to perform opening and rotating actions through the coaxial positioning mechanism.

[0047] Specifically, when welding the round tubes, it is necessary to ensure that the two round tubes are coaxial to prevent incomplete welding. To this end, before laser welding, the two round tubes can be placed between guide rollers 12, and under the action of the bidirectional clamping mechanism, the round tubes are elastically clamped for coarse positioning. After clamping, under the action of the translation component, the movable plate 14 is pushed towards the fixed plate 5, thereby controlling one of the round tubes to move closer to the other round tube through the bidirectional clamping mechanism and guide rollers 12 until the two round tubes abut against each other. At this time, the air pump rotation mechanism operates, and... The coaxial positioning mechanism is controlled by pressurization, causing the positioning plate 19 to unfold. The positioning plate 19 will force the two round tubes to be centered by the internal support center positioning method, so that the two round tubes remain coaxial. Since the clamping force provided by the bidirectional clamping mechanism to the round tubes is elastic clamping, the bidirectional clamping mechanism can passively give way to ensure that the two round tubes will not be unable to adjust the positioning due to clamping interference. After positioning is completed, the pumping rotation mechanism can drive the round tubes to rotate through the coaxial positioning mechanism and the positioning plate 19, so as to perform circumferential welding operation on the round tubes through the welding head 3.

[0048] Please see Figures 1-3 , Figures 5-9 The bidirectional clamping mechanism includes a support plate 6 fixed on the fixed plate 5 and the movable plate 14 respectively. A support sleeve 7 is fixed on the support plate 6. A support rod 8 slides axially inside the support sleeve 7. A push plate 10 is fixed at the end of the support rod 8. A receiving rod 11 is rotatably mounted on the push plate 10 and is symmetrically arranged. The receiving rod 11 is fixedly connected to the guide roller 12. A limiting rod 13 that penetrates the support plate 6 is fixed on the support rod 8. A limiting ring 1301 that abuts against the support plate 6 is fixed on the limiting rod 13. A first spring 9 is sleeved on the support sleeve 7 and the support rod 8. The two ends of the first spring 9 abut against the support plate 6 and the push plate 10 respectively.

[0049] In detail, a multi-axis translation module can be integrated on the support frame 2 to adjust the position of the welding head 3 to match the welding of round pipes of different sizes. The multi-axis translation module can be driven by a linear guide or by a lead screw. This is an application of existing technology and will not be described in detail in this application.

[0050] The translation component is a lead screw drive module that controls the rotation of the lead screw to drive the movable plate 14 to move along the lead screw axis. When welding is not performed, the translation component controls the movable plate 14 to be located at the end of its stroke in a direction away from the fixed plate 5. This is an application of the prior art and will not be described in detail in this application.

[0051] Please see Figure 3 The bidirectional clamping mechanism is symmetrically arranged and is respectively installed on the fixed plate 5 and the movable plate 14. It is used to elastically clamp two round tubes to be welded. In the initial state, the push plate 10 is located at the end of its stroke away from the support plate 6, that is, the distance between the push plate 10 and the support plate 6 is the largest. At this time, the limiting ring 1301 is in abutting state with the support plate 6, and the extension of the first spring 9 in its natural state is greater than the maximum distance between the push plate 10 and the support plate 6. Therefore, the first spring 9 is in a pre-compressed state and always provides the push plate 10 with a pushing force in the direction away from the support plate 6. Under the action of the push plate 10, the two sets of guide rollers 12 are controlled by the receiving rod 11 to be at the forming end of the direction of mutual approach, and the distance between the two sets of guide rollers 12 is less than the minimum diameter of the round tube to be clamped.

[0052] When clamping and welding of the round tube is required, the round tube can be placed between the guide rollers 12. Since the diameter of the round tube is larger than the minimum distance between the two sets of guide rollers 12, the guide rollers 12 need to make way. The guide rollers 12 will drive the push plate 10 to move towards the support plate 6 through the receiving rod 11, thereby driving the support rod 8 to move into the support sleeve 7 and compressing the first spring 9. The support rod 8 will also drive the limiting rod 13 to move, so that the limiting ring 1301 separates from the support plate 6. When both sets of guide rollers 12 are in contact with the outer wall of the round tube, it means that the clamping is completed. Under the action of the guide rollers 12, the round tube can be pre-positioned so that the two round tubes are in a near coaxial or coaxial state, and the round tube is in an elastic clamping state to ensure that the subsequent internal support coaxial positioning can be carried out smoothly.

[0053] In this case, the larger the diameter of the round tube, the greater the compression of the first spring 9 will be. In this way, the elastic clamping force can be provided to the round tube within different ranges according to the diameter of the round tube.

[0054] Please see Figures 1-5 , Figure 7 , Figures 10-12The coaxial positioning mechanism includes a hollow rod 15 rotatably mounted on the movable plate 14. The outer circumferential wall of the hollow rod 15 has symmetrically arranged sliding grooves 1501. A symmetrically arranged movable sleeve 16 is axially slidably arranged on the hollow rod 15. A sealing ring 1601 is fixed inside the movable sleeve 16, which slides and engages with the sliding groove 1501 and is slidably connected to the hollow rod 15. A first hinge rod 17 is hinged to the hollow rod 15 and is symmetrically arranged and equidistantly distributed around the circumference. A second hinge rod 18 is hinged to the outer circumferential wall of the movable sleeve 16. The first hinge rod 17 and the second hinge rod 18 are hinged to the positioning plate 19. The two sealing rings 1601 combine to form a pressurized cavity for adjusting the distance between the two movable sleeves 16.

[0055] Please see Figures 1-5 , Figure 7 , Figures 10-12 The pumping rotation mechanism includes a pumping cylinder 20 fixed to the end of the hollow rod 15, a piston disc 22 slidably and sealed inside the pumping cylinder 20, and a guide post 23 passing through the pumping cylinder 20 fixed on the piston disc 22; it also includes a follower assembly and a pusher assembly disposed on the movable plate 14 for driving the piston disc 22 to move, the follower assembly including a rotating rod 24 fixed on the piston disc 22, a spiral groove 2401 formed on the outer circumference of the rotating rod 24, and a sliding sleeve 25 slidably disposed on the rotating rod 24, the inner wall of the sliding sleeve 25 being fixed with the piston disc 22. The spiral groove 2401 is slidably fitted with the limiting block 2501. The pushing assembly includes a support column 28 and a cylinder 29 fixed on the movable plate 14. The support column 28 is axially slidably provided with a connecting plate 26 fixedly connected to the sliding sleeve 25. The telescopic end of the cylinder 29 is fixedly connected to the connecting plate 26. A second spring 27 is sleeved on the rotating rod 24. The two ends of the second spring 27 abut against the piston disc 22 and the connecting plate 26, respectively. The side wall of the pump cylinder 20 is connected to a conduit 21 that passes through one of the sealing rings 1601 and is connected to the pressurization cavity.

[0056] Please see Figure 12 Furthermore, the piston disc 22 divides the pump cylinder 20 into two chambers. The chamber facing the connecting plate 26 is connected to the outside air, and the chamber facing the conduit 21 is connected to the pressurized cavity through the conduit 21. Under the action of the sealing ring 1601, the cavity between the piston disc 22 and the sealing ring 1601 is in a blocked state.

[0057] Please see Figure 10In the initial state, the connecting plate 26 is located at the end of its stroke away from the piston disc 22, meaning the distance between the connecting plate 26 and the piston disc 22 is at its maximum. At this time, the limiting block 2501 is located at the end of its stroke on the side of the spiral groove 2401 away from the pump cylinder 20. The extension of the second spring 27 in its natural state is greater than the maximum distance between the connecting plate 26 and the piston disc 22. Therefore, the second spring 27 is in a pre-compressed state and always provides a thrust to the piston disc 22 in the direction away from the connecting plate 26. Meanwhile, the limiting block 2501 and the spiral groove 2401... Under the action of the piston, the position of the piston disc 22 can be locked in this state. The piston disc 22 will not move. At this time, the pressurized cavity is in a slightly negative pressure state. Under the action of negative pressure, the sealing ring 1601 controls the two movable sleeves 16 to be at the end of their stroke in the direction of mutual approach. That is, the sealing ring 1601 is at the end of the stroke of the two slide grooves 1501 on the side of mutual approach. Under the action of the movable sleeve 16, the second hinge rod 18 controls the positioning plate 19 to be in the storage state, that is, the distance between the positioning plate 19 and the hollow rod 15 is the smallest.

[0058] When two round tubes are clamped by the bidirectional clamping mechanism and the welding end faces of the two round tubes abut against each other under the action of the translation component, since the length of the hollow rod 15 is slightly greater than the length of the round tube clamped by the bidirectional clamping mechanism located on the movable plate 14 through the guide roller 12, one set of positioning plates 19 will extend out of the round tube and enter into the other round tube, while the other set of positioning plates 19 is located inside the round tube.

[0059] Subsequently, under the action of cylinder 29, the connecting plate 26 is pushed to slide along the axial direction of support column 28, thereby driving the sliding sleeve 25 to move. Since the second spring 27 is in a compressed state, and at this time the second spring 27 has sufficient elasticity compared with the pressurization cavity, under the action of the second spring 27, the rotating rod 24 and piston disc 22 are pushed to move synchronously with the connecting plate 26, so that the position of the limiting block 2501 in the spiral groove 2401 will not change. The piston disc 22 will also pump the gas in the pump cylinder 20 to the pressurization cavity through the conduit 21, so that the pressure in the pressurization cavity gradually increases. When the pressure in the pressurization cavity is positive, under the pressure pushing action, the sealing ring 1601 pushes the two movable sleeves 16 to move in a direction away from each other.

[0060] The movable sleeve 16 will also drive the second hinge rod 18 to move, thereby driving the positioning plate 19 to move. Since there are two first hinge rods 17 that are evenly distributed, the first hinge rods 17 combine to form a parallelogram structure. Under the action of the first hinge rods 17, when the positioning plate 19 moves away from the hollow rod 15, its own angle will not shift, thereby ensuring that the positioning plate 19 can smoothly fit against the inner wall of the round tube.

[0061] When the two sets of positioning plates 19 abut against the inner walls of the two round tubes respectively, since the two sets of positioning plates 19 are in a coaxial state, the two round tubes can be forcibly controlled to be in a coaxial state when the positioning plates 19 abut against the inner walls of the round tubes, so as to eliminate the offset generated during clamping. After positioning is completed, the two round tubes can be controlled to abut against each other again by the translation component, thereby eliminating the problem of gaps between the two round tubes caused by the offset of the round tubes during the positioning process.

[0062] At this time, cylinder 29 continues to control the movement of connecting plate 26 and gradually increases the pressure in the pressurization cavity through piston disc 22 until the resistance provided to piston disc 22 in the pressurization cavity exceeds the thrust provided by second spring 27, and piston disc 22 stops moving. At this time, welding head 3 can be controlled to move to the required welding position of the two round tubes, connecting plate 26 continues to move, and drives sliding sleeve 25 to slide along the axial direction of rotating rod 24, so as to drive limiting block 2501 to slide along spiral groove 2401. Under the action of 401, the drive rotating rod 24 rotates, thereby driving the piston disc 22 to rotate. The piston disc 22 controls the pump cylinder 20 to rotate synchronously through the guide column 23, thereby driving the hollow rod 15 to rotate. At this time, the hollow rod 15 drives the movable sleeve 16 to rotate synchronously through the sliding groove 1501 and the sealing ring 1601, thereby controlling the positioning plate 19 to move through the first hinge rod 17 and the second hinge rod 18. Under the action of friction, the two round tubes rotate synchronously to ensure that the welding head 3 performs circumferential welding treatment on the circumference.

[0063] Preferably, the spiral groove 2401 has more than one spiral turn. Therefore, when relative displacement occurs between the connecting plate 26 and the piston disc 22, the number of rotations of the round tube exceeds one, ensuring complete welding and preventing any missed welds. Throughout the welding process, the air pressure in the pressurized cavity continuously acts on the sealing ring 1601, ensuring that the movable sleeve 16 maintains a stable axial pressure. This ensures that the force between the positioning plate 19 and the inner wall of the round tube is sufficient, preventing the round tube from shifting due to centrifugal force or vibration during rotation. At the same time, since the positioning plate 19 maintains radial stability through the parallelogram mechanism of the first hinge rod 17, its contact area with the tube wall remains constant, effectively avoiding tube wall deformation caused by local stress concentration.

[0064] After welding is completed, the cylinder 29 retracts and drives the connecting plate 26 to reset. Through the cooperation of the spiral groove 2401 and the limit block 2501, the piston disc 22 is controlled to reset, so that the volume of the pressurized cavity increases to form a negative pressure, so that the positioning plate 19 is separated from the inner wall of the round tube. Finally, the positioning plate 19 is driven to detach from the inner wall of the round tube, and the welded round tube can be taken out.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vertical laser welding machine for circular tubes with auxiliary positioning, comprising: The machine base, as well as the support frame, the receiving frame and the fixed plate fixed on the machine base, the support frame is equipped with a welding head, the receiving frame is equipped with a translation component, and the translation component is connected to a movable plate; Its characteristic is that it further includes: A bidirectional clamping mechanism is respectively disposed on the fixed plate and the movable plate, and guide rollers arranged symmetrically are connected to the bidirectional clamping mechanism; A coaxial positioning mechanism is provided on the movable plate, and multiple positioning plates that are symmetrically arranged and circumferentially distributed are connected to the coaxial positioning mechanism. A pumping and rotating mechanism is disposed on the movable plate and connected to the coaxial positioning mechanism. The pumping and rotating mechanism can drive the positioning plate to perform opening and rotating actions through the coaxial positioning mechanism.

2. The vertical laser welding machine for auxiliary positioning of circular tubes according to claim 1, characterized in that, The bidirectional clamping mechanism includes a support plate fixed to the fixed plate and the movable plate respectively. A support sleeve is fixed on the support plate. A support rod slides axially inside the support sleeve. A push plate is fixed to the end of the support rod. A symmetrically arranged receiving rod is rotatably mounted on the push plate. The receiving rod is fixedly connected to the guide roller.

3. The vertical laser welding machine for auxiliary positioning of circular tubes according to claim 2, characterized in that, A limiting rod is fixed on the support rod, which passes through the support plate. A limiting ring is fixed on the limiting rod, which abuts against the support plate. A first spring is sleeved on the support sleeve and the support rod, and the two ends of the first spring abut against the support plate and the push plate, respectively.

4. The vertical laser welding machine for auxiliary positioning of circular tubes according to claim 1, characterized in that, The coaxial positioning mechanism includes a hollow rod rotatably mounted on the movable plate. The outer circumference of the hollow rod has symmetrically arranged sliding grooves. A symmetrically arranged movable sleeve is axially slidably arranged on the hollow rod. A sealing ring is fixed inside the movable sleeve, which slides and engages with the sliding grooves and is slidably and sealingly connected to the hollow rod.

5. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 4, characterized in that, The hollow rod is hinged with a first hinge rod that is symmetrically and evenly distributed around the circumference, and the outer circumferential wall of the movable sleeve is hinged with a second hinge rod. The first hinge rod and the second hinge rod are hinged to the positioning plate.

6. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 4, characterized in that, The pumping rotation mechanism includes a pumping cylinder fixed to the end of the hollow rod, a piston disc slidably and sealed inside the pumping cylinder, and a guide column that passes through the pumping cylinder fixed on the piston disc. It also includes a follower assembly and a pusher assembly disposed on the movable plate for driving the piston disc movement.

7. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 6, characterized in that, The follower assembly includes a rotating rod fixed on the piston disc. The outer circumferential wall of the rotating rod is formed with a helical groove. A sliding sleeve is axially slidably disposed on the rotating rod. A limiting block that slides and engages with the helical groove is fixed on the inner wall of the sliding sleeve.

8. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 7, characterized in that, The pushing assembly includes a support column and a cylinder fixed on the movable plate. A connecting plate that is axially slidably disposed on the support column and fixedly connected to the sliding sleeve is provided. The telescopic end of the cylinder is fixedly connected to the connecting plate. A second spring is sleeved on the rotating rod. The two ends of the second spring abut against the piston disc and the connecting plate, respectively.

9. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 4, characterized in that, The two sealing rings combine to form a pressurized cavity for adjusting the distance between the two movable sleeves.

10. A vertical laser welding machine for auxiliary positioning of circular tubes according to claim 9, characterized in that, The pump cylinder sidewall is connected to a conduit that passes through one of the sealing rings and is connected to the pressurization cavity.

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