A concentric butt-jointed laser welding machine for automobile metal pipes

Abstract

The present invention discloses a concentric butt-jointed laser welding machine for automobile metal pipes, belonging to the field of laser welding technology. The machine comprises a support base, a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure, and a proximity-type pressurizing mechanism. The support base is provided with a limit groove running through its upper and lower sides, and a screw is connected to a bearing in the limit groove. The screw thread passes through a slider, and the slider is engaged and slidably connected in the limit groove, which is used to limit the slider so that it moves along the axis of the screw when the screw rotates. The upper end of the slider is connected to the lower end of a U-shaped frame through a transmission frame, and the U-shaped frame is provided with a self-clamping mechanism, the self-clamping mechanism is provided with a self-adsorption mechanism, and the upper surface of the support base is provided with a pressure relief structure. The invention can not only automatically clamp the metal pipe to be welded, but also ensure that the welding ends of the two sections of metal pipes are tightly fitted, reducing the gap between the two ends, thereby facilitating improved welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding machines, in particular to a concentric butt-jointed laser welding machine for automobile metal pipes. Background Art

[0002] Traditional welding methods such as arc welding and gas welding have shortcomings in many aspects. With the rapid development of modern manufacturing, especially in the fields of automobile manufacturing, aerospace, electronic equipment, etc., the requirements for welding quality and welding efficiency are getting higher and higher;

[0003] The development of laser technology has brought new opportunities to the field of welding. Lasers have the characteristics of high energy density, high directionality and high monochromaticity. The high energy density enables lasers to heat materials to the melting point or even boiling point in an instant, achieving rapid melting and solidification of materials, thereby forming high-quality welded joints.

[0004] The existing automotive metal pipe concentric butt laser welding machine still has the following technical problems when in use, such as:

[0005] 1. The existing automotive metal pipe concentric butt laser welding machine is not convenient for automatically clamping the metal pipe to be welded when in use. The general method is to place the metal pipe in the welding position and then clamp it manually. This method not only increases the labor intensity of the workers, but also reduces the welding efficiency.

[0006] 2. The existing automotive metal pipe concentric butt-joint laser welding machine cannot ensure stable contact between the two sections of metal pipes to be welded, which can easily lead to reduced welding quality and is not conducive to high-quality welding of the two sections of metal pipes;

[0007] Therefore, a kind of automobile metal pipe concentric butt-jointing laser welding machine is needed to solve the above-mentioned problems. Summary of the Invention

[0008] The object of the present invention is to provide a concentric butt-jointed laser welding machine for automobile metal pipes, so as to solve the problem in the above-mentioned background technology that the existing concentric butt-jointed laser welding machine for automobile metal pipes cannot automatically clamp the metal pipes to be welded and cannot ensure that the two sections of metal pipes to be welded are tightly joined.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A concentric butt-jointed laser welding machine for automobile metal pipes comprises a support seat, a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure and a proximity-type boosting mechanism, wherein the support seat is provided with a limit groove running through the upper and lower sides thereof, and the bearing in the limit groove is connected to a screw rod, the screw rod thread passes through the slider, and the slider is engaged and slidably connected in the limit groove, for limiting the slider so that it moves along the axis of the screw rod when the screw rod rotates, the upper end of the slider is connected to the lower end of the U-shaped frame through a transmission frame, and the U-shaped frame is provided with a self-clamping mechanism, the self-clamping mechanism is provided on the self-adsorption mechanism, the upper surface of the support seat is provided with a pressure relief structure, and the pressure relief structure is connected to the self-adsorption mechanism, the support seat is also provided with a proximity-type boosting mechanism, and the self-clamping mechanism is connected to the screw rod through the proximity-type boosting mechanism.

[0011] Preferably, the screw rod is provided with two sections of threads with opposite rotation directions, and the two sections of threads are symmetrically arranged about the mid-perpendicular line of the screw rod.

[0012] Preferably, the slider, the transmission frame, the U-shaped frame, and the self-clamping mechanism and the self-adsorption mechanism provided on the U-shaped frame are each provided with two groups.

[0013] Preferably, the self-clamping mechanism includes a through hole, a piston tube 2 and a spring 1, the piston tube 2 is vertically fixed and passes through the corresponding U-shaped frame, and the inner side of the upper end of the piston tube 2 is seamlessly connected to the lower end of the piston rod 2, the upper end of the piston rod 2 extends to the upper side of the upper end of the piston tube 2, and the upper end of the piston rod 2 is fixedly connected to the main support plate, each of the U-shaped frames is provided with two through holes passing through both sides thereof, and the two through holes on each U-shaped frame are symmetrically arranged about the axis of the piston tube 2, each of the through holes is axially connected to a piston tube 1, and the inner side of the open end of the piston tube 1 is seamlessly slidably connected to one end of the piston rod 1, the other end of the piston rod 1 is axially connected to the lateral support plate, and a spring 1 is provided between the inner bottom end of the piston tube 1 and the end of the piston rod 1 extending into the piston tube 1.

[0014] Preferably, a torsion spring is also provided at the shaft core where the other end of the piston rod is connected to the lateral support plate, which is used to increase the opening degree of the figure-eight structure formed by the two lateral support plates in the same group, so that the metal pipe can be smoothly stuck between the lateral support plate and the main support plate.

[0015] Preferably, the center of gravity of the structure composed of the piston tube 1, the piston rod 1 and the lateral support plate is arranged downward, so that the structure composed of the three can automatically tilt upward.

[0016] Preferably, the self-adsorption mechanism includes a connecting hose, which connects the piston tube 1 and the corresponding lateral support plate. The connecting hose is connected to the piston tube 1 at a portion between the end of the piston rod 1 extending into the piston tube 1 and the open end of the piston tube 1, and the middle part of the piston rod 1 and the open end of the piston tube 1 are also seamlessly slidably connected, so that the connecting hose can transport gas to the inside of the piston tube 1 when the piston rod 1 moves into the piston tube 1.

[0017] Preferably, the lateral support plate is a hollow structure, and the side thereof facing away from the piston rod is evenly provided with through holes passing through the interior thereof. The side of the lateral support plate facing away from the piston rod is also provided with a rubber gasket, and the rubber gasket is densely covered with holes and grooves passing through both sides thereof, and the holes and grooves on the gasket are arranged one-to-one correspondingly to the through holes on the lateral support plate.

[0018] Preferably, the pressure relief structure includes a mounting tube and a limiting rod 2, the mounting tube is fixedly mounted on the upper surface of the support seat, and the upper end of the mounting tube movably extends into the lower end of the pressing rod, a spring 3 is provided between the lower surface of the upper end of the pressing rod and the upper surface of the mounting tube, and the lower end of the pressing rod is coaxially fixedly connected to a wedge block, the lower surface of the wedge block movably extends into the upper end of the limiting rod 2, and the lower end of the limiting rod 2 is coaxially fixedly connected to the inner top end of the mounting tube, and both sides of the wedge block They are respectively tightly attached to the ends of the intake pipe and the Y-shaped hose extending into the mounting tube, and the other two ends of the Y-shaped hose are respectively connected to the middle parts of the two ventilation hoses. The two ends of each ventilation hose are movably passed through the corresponding piston tube, and a conveying channel is provided on the part of the piston rod extending into the piston tube. The conveying channel connects the ventilation hose and the connecting hose. The side of the wedge block in contact with the intake pipe and the Y-shaped hose is provided with a rubber layer, and the part of the intake pipe and the Y-shaped hose passing through the mounting tube is made of metal.

[0019] Preferably, the approach-type boosting mechanism includes a support frame, a transmission gear and a spring 2, the transmission gear key is connected to the middle part of the screw rod, and the transmission gear is meshed with a toothed plate, the toothed plate is horizontally suspended on the upper surface of the support seat, and both sides of the toothed plate are slidably connected to the inner side of the support frame, the four corners of the support frame are fixedly supported on the upper surface of the support seat, and one end of the toothed plate is movably extended out of the support frame, a piston tube 3 is installed on the upper surface of the support frame, and a piston rod 3 is seamlessly slidably connected to the inner side of the open end of the piston tube 3, and the piston tube 3 is connected to the inner side of the open end of the piston tube 3 through two transmission The air hose is respectively connected to the interior of the two piston tubes 2, and the connection part of the piston tube 3 and the air hose is between the end of the piston rod 3 extending into the piston tube 3 and the open end of the piston tube 3. The open end of the piston tube 3 is also connected to the middle part of the piston rod 3 by a seamless sliding connection, and the piston rod 3 is arranged on the end outside the piston tube 3 and a limit rod 1 coaxial with it is movably extended into it. The limit rod 1 is fixedly connected to the raised part of the tooth plate, and a spring 2 nested in the outside of the limit rod 1 is arranged between the raised part of the tooth plate and the open end of the piston tube 3.

[0020] Compared with the existing technology, the beneficial effects of the present invention are: the automotive metal pipe concentric butt laser welding machine can not only automatically clamp the metal pipe to be welded, but also ensure that the welding ends of the two sections of metal pipes are tightly fitted, reducing the gap between the two ends, thereby facilitating improved welding quality:

[0021] 1. Based on the mass of the metal pipe to be welded, the second piston rod can be directly pressed against the second piston tube, so that the second piston rod is lowered to the lowest height it can be lowered. During this process, the lateral support plate will also contact the outside of the metal pipe, and the first piston tube and the first piston rod will also rotate accordingly, thereby preliminarily clamping the metal pipe through the lateral support plate and the main support plate. As the first piston tube and the first piston rod rotate accordingly, the first piston rod will move into the first piston tube. At this time, the connecting hose will transport the gas in the lateral support plate into the first piston tube, thereby making the lateral support plate stably adsorbed on the outer wall of the pipe, thereby further clamping the metal pipe.

[0022] 2. When the two welded sections of metal pipe need to be removed, the pressing rod can be pressed to move the wedge block downward, so that the air intake pipe and Y-shaped hose are no longer blocked. At this time, the negative pressure in the lateral support plate can be supplemented by the external air, so that the outer wall of the metal pipe is no longer adsorbed on the lateral support plate. At this time, the two welded sections of metal pipe can be directly removed, which also avoids the problem of inconvenience in removing the two welded sections of metal pipe with previous laser welding machines.

[0023] 3. In the process of fixing the two sections of metal pipes to be welded on the U-shaped frame, as the piston rod 2 moves downward, the gas in the piston tube 2 will be pressed toward the piston tube 3, so that the piston rod 3 drives the gear plate to move, and then the screw rod can be driven to rotate through the transmission gear, so that the two U-shaped frames are brought closer to each other, thereby ensuring that the two sections of metal pipes can be in close contact, reducing the possibility of gaps between the welding ends of the two sections of metal pipes, and helping to improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0025] Figure 2 It is a partial longitudinal cross-sectional structural schematic diagram of the present invention;

[0026] Figure 3 It is a schematic diagram of a partial transverse cross-sectional structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of point A;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of point B;

[0030] Figure 7 It is a schematic diagram of the longitudinal structure of the present invention;

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of point C in the middle;

[0032] Figure 9 It is a schematic diagram of the connection structure of the ventilation hose and the Y-shaped hose of the present invention.

[0033] In the figure: 1. Support seat; 2. Limiting groove; 3. Slider; 4. Screw rod; 5. Transmission frame; 6. U-shaped frame; 7. Through hole; 8. Piston tube one; 9. Piston rod one; 10. Lateral support plate; 11. Piston tube two; 12. Piston rod two; 13. Connecting hose; 14. Mounting pipe; 15. Ventilation hose; 16. Spring one; 17. Inlet pipe; 18. Delivery channel; 19. Y-shaped hose; 20. Main support plate; 21. Support frame; 22. Piston tube three; 23. Piston rod three; 24. Air delivery hose; 25. Tooth plate; 26. Transmission gear; 27. Limiting rod one; 28. Spring two; 29. Pressing rod; 30. Spring three; 31. Wedge block; 32. Limiting rod two. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figures 1-9 , the present invention provides the following technical solutions:

[0036] Embodiment 1: In order to solve the problem that the previous automobile metal pipe concentric butt-jointing laser welding machine requires manual clamping, thereby reducing the welding efficiency, the following technical solution is provided, specifically, a automobile metal pipe concentric butt-jointing laser welding machine, including a support seat 1, a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure and a proximity-type pressurizing mechanism. The support seat 1 is provided with a limiting groove 2 running through the upper and lower sides thereof, and the bearing in the limiting groove 2 is connected to a screw rod 4, the screw rod 4 is threaded through the slider 3, and the slider 3 is engaged and slidably connected in the limiting groove 2, which is used to limit the slider 3 so that it moves along the axis of the screw rod 4 when the screw rod 4 rotates. The upper end of the slider 3 is connected to the lower end of the U-shaped frame 6 through the transmission frame 5, and the U-shaped frame 6 is provided with a self-clamping mechanism. The self-clamping mechanism A self-adsorption mechanism is provided on the top, a pressure relief structure is provided on the upper surface of the support seat 1, and the pressure relief structure is connected to the self-adsorption mechanism, two sections of threads with opposite rotation directions are provided on the screw rod 4, and the two sections of threads are symmetrically arranged about the mid-vertical line of the screw rod 4, the slider 3, the transmission frame 5 and the U-shaped frame 6, and the self-clamping mechanism and the self-adsorption mechanism arranged on the U-shaped frame 6 are all provided with two groups, and the self-clamping mechanism includes a through hole 7, a piston tube 11 and a spring 16. The piston tube 11 is vertically fixed and passes through the corresponding U-shaped frame 6, and the lower end of the piston rod 12 is seamlessly connected to the inner side of the upper end of the piston tube 11. The upper end of the piston rod 12 extends to the upper end of the piston tube 11, and the upper end of the piston rod 12 is fixedly connected to the main support plate 20. There are two through holes 7 running through both sides thereof, and the two through holes 7 on each U-shaped frame 6 are symmetrically arranged about the axis of the piston tube 11, and a piston tube 8 is axially connected in each through hole 7, and one end of a piston rod 9 is seamlessly slidably connected to the inner side of the open end of the piston tube 8, and the other end of the piston rod 9 is axially connected to a lateral support plate 10, and a spring 16 is arranged between the inner bottom end of the piston tube 8 and the end of the piston rod 9 extending into the piston tube 8. When in use, the support seat 1 is installed on a sliding mechanism, for example, it is installed on the slide rail of a welding machine, so as to facilitate adjusting the welding position of the metal pipe to the corresponding position of the laser welding gun, and then the metal pipe to be welded is placed on the main support plate 20. The main support plate 20 can be made to move in the direction of rotation by the gravity of the metal pipe. The support plate 20 moves directly downward to the lowest point it can reach. During this process, the lateral support plate 10 will also contact the metal pipe. At the same time, the structure composed of the piston tube 8 and the piston rod 9 will rotate as the metal pipe moves downward. In this process, the metal pipe can be limited by the two lateral support plates 10 and the main support plate 20. A torsion spring is also provided at the shaft core where the other end of the piston rod 9 is connected to the lateral support plate 10, which is used to increase the opening degree of the eight-shaped structure composed of the two lateral support plates 10 in the same group, so that the metal pipe can be smoothly stuck between the lateral support plate 10 and the main support plate 20. The center of gravity of the structure composed of the piston tube 8, the piston rod 9 and the lateral support plate 10 is set downward, so that the structure composed of the three can automatically tilt upward.The self-adsorption mechanism includes a connecting hose 13, which connects the piston tube 8 and the corresponding lateral support plate 10. The connecting hose 13 and the piston tube 8 are connected at a position between the end of the piston rod 9 extending into the piston tube 8 and the open end of the piston tube 8, and the middle part of the piston rod 9 and the open end of the piston tube 8 are also seamlessly slidably connected, so that when the piston rod 9 moves into the piston tube 8, the connecting hose 13 can transport gas to the inside of the piston tube 8. The structure composed of the piston tube 8 and the piston rod 9 will rotate as the metal pipe moves downward, and the piston rod 9 will gradually move into the piston tube 8. Then, when the lateral support plate 10 is close to the outer wall of the metal pipe, the connecting hose 13 transports the gas in the lateral support plate 10 to the piston tube 8, so that the lateral support plate 10 can tightly absorb the metal pipe, thereby fixing the metal pipe. The lateral support plate 10 is a hollow structure, and the side facing away from the piston rod 9 is evenly provided with through holes running through the inside thereof. A rubber gasket is also provided on the side facing away from the piston rod 9. The rubber gasket is densely covered with holes running through both sides thereof. The holes and grooves on the gasket are arranged in a one-to-one correspondence with the through holes on the lateral support plate 10. The pressure relief structure includes a mounting tube 14 and a limiting rod 232. The mounting tube 14 is fixedly mounted on the upper surface of the support seat 1, and the upper end of the mounting tube 14 is movably extended into the lower end of the pressing rod 29. The upper end of the pressing rod 29 is pressed downward. A spring three 30 is provided between the surface and the upper surface of the mounting tube 14, which is nested in the outer side of the lower end of the pressing rod 29, and the lower end of the pressing rod 29 is coaxially fixedly connected to a wedge block 31, the lower surface of the wedge block 31 movably extends into the upper end of the limiting rod 2 32, and the lower end of the limiting rod 2 32 is coaxially fixedly connected to the inner top end of the mounting tube 14, the two sides of the wedge block 31 are respectively tightly attached to the ends of the intake pipe 17 and the Y-shaped hose 19 extending into the mounting tube 14, and the other two ends of the Y-shaped hose 19 are respectively connected with the middle parts of the two ventilation hoses 15, and the two ends of each ventilation hose 15 are movably penetrated through the corresponding piston tube 8, and the part of the piston rod 9 extending into the piston tube 8 is provided with a delivery channel 18, and the delivery The delivery channel 18 connects the ventilation hose 15 and the connecting hose 13. The side of the wedge block 31 that contacts the intake pipe 17 and the Y-shaped hose 19 is provided with a rubber layer. The portion of the intake pipe 17 and the Y-shaped hose 19 that passes through the mounting tube 14 is made of metal. When it is necessary to remove the welded metal pipe, the pressing rod 29 is pressed to move the wedge block 31 downward, causing it to separate from the intake pipe 17 and the Y-shaped hose 19. At this time, the outside air can enter the connecting hose 13 through the intake pipe 17, the Y-shaped hose 19, the ventilation hose 15, and the delivery channel 18 in sequence. This can replenish the negative pressure in the lateral support plate 10, so that the lateral support plate 10 is no longer adsorbed on the outer wall of the metal pipe, facilitating the removal of the welded metal pipe.

[0037] Example 2: In order to solve the problem that the previous concentric butt-jointing laser welding machine for automobile metal pipes cannot ensure the tight butt-jointing of the welded ends of two sections of metal pipes, the following technical solution is provided. Specifically, the support seat 1 is also provided with a proximity boosting mechanism, and the self-clamping mechanism is connected to the screw 4 through the proximity boosting mechanism.

[0038] The close-type boosting mechanism includes a support frame 21, a transmission gear 26 and a spring 28. The transmission gear 26 is keyed to the middle of the screw rod 4, and the transmission gear 26 is meshed with the tooth plate 25. The tooth plate 25 is horizontally suspended on the upper surface of the support base 1, and both sides of the tooth plate 25 are slidably connected to the inner side of the support frame 21. The four corners of the support frame 21 are fixedly supported on the upper surface of the support base 1, and one end of the tooth plate 25 is movably extended from the support frame 21. The upper surface of the support frame 21 is installed with a piston tube 3 22, and the inner side of the open end of the piston tube 3 22 is The piston rod 3 23 is seamlessly slidably connected, and the piston tube 3 22 is connected to the interior of the two piston tubes 2 11 through two gas hoses 24. The connection part between the piston tube 3 22 and the gas hose 24 is between the end of the piston rod 3 23 extending into the piston tube 3 22 and the open end of the piston tube 3 22. The open end of the piston tube 3 22 is also connected to the middle part of the piston rod 3 23 by a seamless sliding connection. The piston rod 3 23 is arranged on the end outside the piston tube 3 22 and is movably extended with a limit rod 1 27 coaxial with it. The limit rod 1 2 The raised portion 7 is fixedly connected to the tooth plate 25, and a spring 28 is provided between the raised portion of the tooth plate 25 and the open end of the piston tube 3 22, which is nested on the outside of the limit rod 1 27. When the metal pipe presses down the main support plate 20, the main support plate 20 moves down, driving the piston rod 2 12 to move into the piston tube 2 11, thereby squeezing the gas in the piston tube 2 11, so that the gas in the piston tube 2 11 enters the piston tube 3 22 through the gas hose 24, and causes the piston rod 3 23 to move into the interior of the piston tube 3 22, through the piston rod 3 23 The movement of the tooth plate 25 will cause the tooth plate 25 to move with it, and then the screw rod 4 can be driven to move through the transmission gear 26, so that the two U-shaped frames 6 are close to each other, so that in the process of clamping the two sections of metal pipes in the U-shaped frame 6, the ends of the two sections of metal pipes to be welded can be stably and tightly docked, which helps to improve the quality of welding. After the two sections of metal pipes are clamped, the welding ends of the two sections of metal pipes can be adjusted to the corresponding position of the laser welding gun by adjusting the support seat 1 installed on the slide rail of the welding machine tool, so as to facilitate welding with the laser welding gun.

[0039] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A concentric butt-jointed laser welding machine for automobile metal pipes, comprising a support seat (1), a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure and a proximity-type pressurization mechanism, characterized in that: The support seat (1) is provided with a limiting groove (2) passing through the upper and lower sides thereof, and a screw rod (4) is connected to the bearing in the limiting groove (2), the screw rod (4) is threadedly passed through the slider (3), and the slider (3) is engaged and slidably connected in the limiting groove (2), for limiting the slider (3) so that it moves along the axis of the screw rod (4) when the screw rod (4) rotates. The upper end of the slider (3) is connected to the lower end of the U-shaped frame (6) through the transmission frame (5), and the U-shaped frame (6) is provided with a self-clamping mechanism, the self-clamping mechanism includes a through hole (7), a second piston tube (11) and a first spring (16), the second piston tube (11) is vertically fixed and passes through the corresponding U-shaped frame (6), and the inner side of the upper end of the second piston tube (11) is seamless. The lower end of the piston rod 2 (12) is connected, the upper end of the piston rod 2 (12) extends to the upper end of the piston tube 2 (11), and the upper end of the piston rod 2 (12) is fixedly connected to the main support plate (20), each of the U-shaped frames (6) is provided with two through holes (7) passing through both sides thereof, and the two through holes (7) on each U-shaped frame (6) are symmetrically arranged about the axis of the piston tube 2 (11), each through hole (7) is axially connected to the piston tube 1 (8), and the inner side of the open end of the piston tube 1 (8) is seamlessly slidably connected to one end of the piston rod 1 (9), the other end of the piston rod 1 (9) is axially connected to the lateral support plate (10), the inner bottom end of the piston tube 1 (8) and the piston rod 1 (9) extend into A spring (16) is provided between one end of the piston tube (8), and a self-adsorption mechanism is provided on the self-clamping mechanism, and the self-adsorption mechanism includes a connecting hose (13), which connects the piston tube (8) and the corresponding lateral support plate (10). The connecting hose (13) is connected to the piston tube (8) at a position between the end of the piston rod (9) extending into the piston tube (8) and the open end of the piston tube (8), and the middle part of the piston rod (9) and the open end of the piston tube (8) are also seamlessly slidably connected, so that when the piston rod (9) moves into the piston tube (8), the connecting hose (13) delivers gas to the inside of the piston tube (8). The upper surface of the support seat (1) is provided with a release The pressure structure is provided, and the pressure relief structure is connected to the self-adsorption mechanism. The support seat (1) is also provided with a proximity boosting mechanism, and the self-clamping mechanism is connected to the screw rod (4) through the proximity boosting mechanism. The proximity boosting mechanism includes a support frame (21), a transmission gear (26) and a spring (28). The transmission gear (26) is key-connected to the middle of the screw rod (4), and the transmission gear (26) is meshed with the tooth plate (25). The tooth plate (25) is horizontally suspended on the upper surface of the support seat (1), and both sides of the tooth plate (25) are slidably connected to the inner side of the support frame (21). The four corners of the support frame (21) are fixedly supported on the upper surface of the support seat (1), and one end of the tooth plate (25) is movably extended out of the support frame (21).A piston tube three (22) is installed on the upper surface of the support frame (21), and a piston rod three (23) is seamlessly slidably connected to the inner side of the open end of the piston tube three (22). The piston tube three (22) is connected to the interior of the two piston tubes two (11) through two air supply hoses (24), and the connection portion between the piston tube three (22) and the air supply hose (24) is between the end of the piston rod three (23) extending into the piston tube three (22) and the open end of the piston tube three (22). The open end of the piston tube three (22) is also connected to the middle of the piston rod three (23) by a seamless sliding connection, and the piston rod three (23) is arranged on the end of the piston tube three (22) outside and is movably extended with a limit rod one (27) coaxial with it. The limit rod one (27) is fixedly connected to the raised part of the tooth plate (25), and a spring two (28) is provided between the raised part of the tooth plate (25) and the open end of the piston tube three (22) and is nested on the outside of the limit rod one (27).

2. The concentric butt-jointed laser welding machine for automobile metal pipes according to claim 1, characterized in that: The screw rod (4) is provided with two sections of threads with opposite rotation directions, and the two sections of threads are symmetrically arranged about the perpendicular midline of the screw rod (4).

3. The concentric butt-jointed laser welding machine for automobile metal pipes according to claim 2, characterized in that: The slider (3), the transmission frame (5), the U-shaped frame (6), and the self-clamping mechanism and the self-adsorption mechanism provided on the U-shaped frame (6) are each provided with two groups.

4. The concentric butt-jointed laser welding machine for automobile metal pipes according to claim 3, characterized in that: A torsion spring is also provided at the shaft core where the other end of the piston rod (9) is connected to the lateral support plate (10), for increasing the opening degree of the figure-eight structure formed by the two lateral support plates (10) in the same group, so that the metal pipe can be smoothly stuck between the lateral support plate (10) and the main support plate (20).

5. The concentric butt-jointed laser welding machine for automobile metal pipes according to claim 4, characterized in that: The center of gravity of the structure formed by the piston tube (8), the piston rod (9) and the lateral support plate (10) is arranged downward, so that the structure formed by the three can automatically tilt upward.

6. The automotive metal pipe concentric butt-jointing laser welding machine according to claim 5, characterized in that: The lateral support plate (10) is a hollow structure, and a through hole is evenly arranged on the side of the lateral support plate (10) facing away from the piston rod (9) and passing through the inside thereof. A rubber gasket is also arranged on the side of the lateral support plate (10) facing away from the piston rod (9), and the rubber gasket is densely covered with holes and grooves passing through both sides thereof, and the holes and grooves on the gasket are arranged in a one-to-one correspondence with the through holes on the lateral support plate (10).

7. The automotive metal pipe concentric butt-jointing laser welding machine according to claim 6, characterized in that: The pressure relief structure includes a mounting tube (14) and a limiting rod (32), wherein the mounting tube (14) is fixedly mounted on the upper surface of the support seat (1), and the upper end of the mounting tube (14) is movably extended into the lower end of the pressing rod (29), and a spring (30) is provided between the lower surface of the upper end of the pressing rod (29) and the upper surface of the mounting tube (14), and is nested in the outer side of the lower end of the pressing rod (29), and the lower end of the pressing rod (29) is coaxially fixedly connected with a wedge block (31), the lower surface of the wedge block (31) is movably extended into the upper end of the limiting rod (32), and the lower end of the limiting rod (32) is coaxially fixedly connected to the inner top end of the mounting tube (14), and the two sides of the wedge block (31) are respectively connected to the air intake The ends of the tube (17) and the Y-shaped hose (19) extending into the mounting tube (14) are tightly attached, and the other two ends of the Y-shaped hose (19) are respectively connected to the middle parts of the two ventilation hoses (15). The two ends of each ventilation hose (15) are respectively movable through the corresponding piston tube (8), and a conveying channel (18) is provided on the part of the piston rod (9) extending into the piston tube (8). The conveying channel (18) connects the ventilation hose (15) and the connecting hose (13). The side of the wedge-shaped block (31) in contact with the intake pipe (17) and the Y-shaped hose (19) is provided with a rubber layer, and the parts of the intake pipe (17) and the Y-shaped hose (19) extending through the mounting tube (14) are made of metal.

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