Concentric butt-joint type laser welding machine for automobile metal pipeline

Abstract

The invention discloses an automobile metal pipeline concentric butt-joint type laser welding machine, and belongs to the technical field of laser welding, the automobile metal pipeline concentric butt-joint type laser welding machine comprises a supporting seat, a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure and an approaching type pressurization mechanism, the supporting seat is provided with a limiting groove penetrating through the upper side and the lower side of the supporting seat, and a lead screw is connected in the limiting groove through a bearing; the lead screw penetrates through the sliding block in a threaded mode, the sliding block is connected into the limiting groove in a clamped and sliding mode and used for limiting the sliding block so that the sliding block can move along the axis of the lead screw when the lead screw rotates, the upper end of the sliding block is connected with the lower end of the U-shaped frame through a transmission frame, a self-clamping mechanism is arranged on the U-shaped frame, a self-adsorption mechanism is arranged on the self-clamping mechanism, and the self-adsorption mechanism is connected with the sliding block through a transmission frame. And a pressure relief structure is arranged on the upper surface of the supporting seat. According to the metal pipeline welding device, the metal pipeline to be welded can be automatically clamped, it can be guaranteed that the welding ends of the two metal pipelines are tightly attached, the gap between the two ends is reduced, and therefore the welding quality can be improved.

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; The development of laser technology has brought new opportunities to the field of welding. Laser has the characteristics of high energy density, high directionality and high monochromaticity. The high energy density enables the laser to heat the material to the melting point or even boiling point in an instant, achieving rapid melting and solidification of the material, thus forming a high-quality welded joint. The existing automotive metal pipe concentric butt laser welding machine still has the following technical problems when in use, such as: 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 the metal pipe manually. This method not only increases the labor intensity of the staff, but also reduces the welding efficiency; 2. The existing automotive metal pipe concentric butt laser welding machine cannot ensure the stable contact between the two sections of metal pipes to be welded when in use, which easily leads to reduced welding quality and is not conducive to high-quality welding of the two sections of metal pipes; Therefore, a kind of automobile metal pipe concentric butt-joint laser welding machine is needed to solve the above problems. Summary of the invention

[0003] The purpose 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 the tight butt joint of the two sections of metal pipes to be welded.

[0004] To achieve the above object, the present invention provides the following technical solutions: 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 limiting groove penetrating through the upper and lower sides thereof, and a screw rod is connected to a bearing in the limiting groove, the screw rod thread passes through a slider arrangement, and the slider is slidably connected in the limiting 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 a U-shaped frame through a transmission frame, and a self-clamping mechanism is provided on the U-shaped frame, a self-adsorption mechanism is provided on the self-clamping mechanism, a pressure relief structure is provided on the upper surface of the support seat, 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.

[0005] 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.

[0006] Preferably, the sliding block, the transmission frame and the U-shaped frame, as well as the self-clamping mechanism and the self-adsorption mechanism arranged on the U-shaped frame are each provided with two groups.

[0007] 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 penetrates 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 with a piston tube 1, and one end of the piston rod 1 is seamlessly slidably connected to the inner side of the open end of the piston tube 1, the other end of the piston rod 1 is axially connected to the lateral support plate, and a spring 1 is arranged between the inner bottom end of the piston tube 1 and the end of the piston rod 1 extending into the piston tube 1.

[0008] 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.

[0009] Preferably, the center of gravity of the structure formed by the piston tube 1, the piston rod 1 and the lateral support plate is arranged downward, so that the structure formed by the three can automatically tilt upward.

[0010] Preferably, the self-adsorption mechanism includes a connecting hose, which connects the piston tube 1 and the corresponding lateral support plate. The connecting hose and the piston tube 1 are connected 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.

[0011] 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 thereof 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.

[0012] Preferably, the pressure release 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 arranged between the lower surface of the upper end of the pressing rod and the upper surface of the mounting tube and is nested in the outer side of the lower end of the pressing rod, and the lower end of the pressing rod is coaxially fixedly connected with 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 penetrated 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 parts of the intake pipe and the Y-shaped hose passing through the mounting tube are made of metal.

[0013] Preferably, the proximity 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 portion between 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 of the outside of the piston tube 3 and a limit rod 1 coaxial therewith is movably extended therein, the limit rod 1 is fixedly connected to the raised portion of the tooth plate, and a spring 2 nested in the outside of the limit rod 1 is arranged between the raised portion of the tooth plate and the open end of the piston tube 3.

[0014] Compared with the prior art, the invention has the following beneficial effects: the automobile metal pipe concentric butt-joint laser welding machine can not only automatically clamp the metal pipe to be welded, but also ensure that the welding ends of two sections of metal pipes are closely fitted, reduce the gap between the two ends, and thus help improve the quality of welding: 1. According to the quality of the metal pipe to be welded, the piston rod 2 can be directly pressed against the piston tube 2, so that the piston rod 2 can be lowered to the lowest height it can be lowered. In this process, the lateral support plate will also contact the outside of the metal pipe, and the piston tube 1 and the piston rod 1 will also rotate accordingly, so that the metal pipe is initially clamped by the lateral support plate and the main support plate. In the process of the piston tube 1 and the piston rod 1 rotating accordingly, the piston rod 1 will move into the piston tube 1. At this time, the connecting hose will transport the gas in the lateral support plate to the piston tube 1, so that the lateral support plate can be stably adsorbed on the outer wall of the pipe, thereby further clamping the metal pipe; 2. When it is necessary to remove the two welded metal pipes, the pressing rod can be pressed to move the wedge block downward so that the air intake pipe and the Y-shaped hose are no longer blocked. At this time, the negative pressure in the lateral support plate can be supplemented by the external gas, so that the outer wall of the metal pipe is no longer adsorbed on the lateral support plate. At this time, the two welded metal pipes can be directly removed, which also avoids the problem that the previous laser welding machine is not convenient to remove the two welded metal pipes; 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 tooth plate to move, and then the screw rod can be driven to rotate through the transmission gear, so that the two U-shaped frames can be 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

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a partial longitudinal cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of a partial transverse cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of point A; Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of point B in the middle; Figure 7 It is a schematic diagram of the longitudinal structure of the present invention; Figure 8 For the present invention Figure 7 The schematic diagram of the enlarged structure of point C in the middle; Fig. 9 It is a schematic diagram of the connection structure of the ventilation hose and the Y-shaped hose of the present invention.

[0016] In the figure: 1. support seat; 2. limit 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. intake pipe; 18. delivery channel; 19. Y-shaped hose; 20. main support plate; 21. support frame; 22. piston tube three; 23. piston rod three; 24. gas delivery hose; 25. tooth plate; 26. transmission gear; 27. limit rod one; 28. spring two; 29. ​​pressing rod; 30. spring three; 31. wedge block; 32. limit rod two. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 9 , the present invention provides the following technical solutions: Embodiment 1: In order to solve the problem that the previous automotive metal pipe concentric butt laser welding machine requires manual clamping, thereby reducing the welding efficiency, the following technical solution is provided, specifically, a automotive metal pipe concentric butt laser welding machine, including a support seat 1, a self-clamping mechanism, a self-adsorption mechanism, a pressure relief structure and a proximity boosting mechanism, the support seat 1 is provided with a limit groove 2 running through the upper and lower sides thereof, and the bearing in the limit groove 2 is connected to a screw rod 4, the screw rod 4 is threaded through the slider 3, and the slider 3 is slidably connected in the limit 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 arranged on the support seat 1, a pressure relief structure is arranged 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 arranged 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 arranged in two groups, 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 penetrates 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, each U-shaped frame 6 is 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, 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 tool, 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, and the main support plate 20 can be made to move in the direction of the main support plate 20 by the gravity of the metal pipe. The support plate 20 moves directly downward to the lowest point it can reach. During the 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. During 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 transports gas to the inside of the piston tube 8. The structure formed by 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, and 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 closely absorb the metal pipe, so that the metal pipe can be fixed. The lateral support plate 10 is a hollow structure, and the side of the lateral support plate 10 facing away from the piston rod 9 is evenly provided with through holes that penetrate the inside thereof. The side of the lateral support plate 10 facing away from the piston rod 9 is also provided with a rubber gasket, and the rubber gasket is densely covered with holes and grooves that penetrate the two sides thereof. The holes and grooves on the gasket are arranged one by one in 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, and the upper end of the pressing rod 29 is lowered. A spring 30 is provided between the surface 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 movably extends into the upper end of the limiting rod 23, and the lower end of the limiting rod 23 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, the two ends of each ventilation hose 15 are respectively 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 conveying channel 18, and the conveying channel 18 is provided. The delivery channel 18 connects the ventilation hose 15 and the communication hose 13. The side of the wedge block 31 that contacts the air intake pipe 17 and the Y-shaped hose 19 is set as a rubber layer, and the part of the air intake pipe 17 and the Y-shaped hose 19 that penetrates the installation pipe 14 is made of metal. When it is necessary to remove the welded metal pipe, press the pressing rod 29 to drive the wedge block 31 to move downward to separate it from the air intake pipe 17 and the Y-shaped hose 19. At this time, the external gas can enter the communication hose 13 through the air intake pipe 17, the Y-shaped hose 19, the ventilation hose 15 and the delivery channel 18 in turn, and then the negative pressure in the lateral support plate 10 can be supplemented, so that the lateral support plate 10 is no longer adsorbed on the outer wall of the metal pipe, which is helpful to remove the welded metal pipe.

[0019] Embodiment 2: In order to solve the problem that the previous automotive metal pipe concentric butt laser welding machine cannot ensure the tight butt connection of the 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.

[0020] 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 a toothed plate 25. The toothed plate 25 is horizontally suspended on the upper surface of the support seat 1, and both sides of the toothed 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 toothed plate 25 is movably extended out of 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, and the connection portion 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 of the piston tube 3 22 outside and has a limit rod 1 27 coaxial with it movably extended therein. The limit rod 1 2 The raised portion 7 is fixedly connected to the tooth plate 25, and a spring 28 is arranged between the raised portion 7 of the tooth plate 25 and the open end of the piston tube 3 22, and is nested in the outer side 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 the piston rod 3 23 moves to the inside of the piston tube 3 22, and 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 on 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 the laser welding gun to perform welding.

[0021] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0022] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 release structure and a close-type pressurization mechanism, characterized in that: The support seat (1) is provided with a limit groove (2) passing through the upper and lower sides thereof, and a screw rod (4) is connected to a bearing in the limit groove (2), the screw rod (4) is threadedly passed through the slider (3), and the slider (3) is slidably connected in the limit groove (2) for limiting the slider (3) so that the slider (3) 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 a transmission frame (5), and the U-shaped frame (6) is provided with a self-clamping mechanism, and the self-clamping mechanism is provided with a self-adsorption mechanism, the upper surface of the support seat (1) is provided with a pressure relief structure, 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.

2. The automotive metal pipe concentric butt-joint laser welding machine 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 automotive metal pipe concentric butt-joint laser welding machine according to claim 2, characterized in that: The slide block (3), the transmission frame (5) and the U-shaped frame (6), as well as the self-clamping mechanism and the self-adsorption mechanism arranged on the U-shaped frame (6), are all arranged in two groups.

4. The automotive metal pipe concentric butt-joint laser welding machine according to claim 3 is characterized by: The self-clamping mechanism comprises a through hole (7), a piston tube (11) and a spring (16); the piston tube (11) is vertically fixed and penetrates the corresponding U-shaped frame (6); the inner side of the upper end of the piston tube (11) is seamlessly connected to the lower end of the piston rod (12); the upper end of the piston rod (12) extends above the upper end of the piston tube (11); the upper end of the piston rod (12) is fixedly connected to the main support plate (20); each of the U-shaped frames (6) is provided with two springs penetrating the two sides thereof. The U-shaped frame (6) has two through holes (7) therein, and the two through holes (7) on each U-shaped frame (6) are symmetrically arranged about the axis of the piston tube (11); a piston tube (8) is axially connected to 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); 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).

5. The automotive metal pipe concentric butt laser welding machine according to claim 4, 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 degree of opening 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 clamped between the lateral support plate (10) and the main support plate (20).

6. The automotive metal pipe concentric butt-joint laser welding machine according to claim 5, characterized in that: The center of gravity of the structure formed by the piston tube 1 (8), the piston rod 1 (9) and the lateral support plate (10) is arranged to be biased downward, so that the structure formed by the three can automatically tilt upward.

7. The automotive metal pipe concentric butt-joint laser welding machine according to claim 6, characterized in that: The self-adsorption mechanism comprises a connecting hose (13), the connecting hose (13) connecting 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 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) conveys gas into the piston tube (8).

8. The automotive metal pipe concentric butt-joint laser welding machine according to claim 7, characterized in that: The lateral support plate (10) is a hollow structure, and through holes penetrating the inside of the lateral support plate (10) are evenly arranged on the side facing away from the piston rod (9). A rubber gasket is also arranged on the side facing away from the piston rod (9), and the rubber gasket is densely covered with holes and grooves penetrating the two 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).

9. The automotive metal pipe concentric butt-joint laser welding machine according to claim 8, characterized in that: The pressure release structure comprises a mounting tube (14) and a second limiting rod (32); 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) movably extends into the lower end of a pressing rod (29); a third spring (30) is arranged 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); 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) movably extends into the upper end of the second limiting rod (32), and the lower end of the second limiting rod (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 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 movably connected to the corresponding piston tube (8), and a delivery channel (18) is provided on the part of the piston rod (9) extending into the piston tube (8). The delivery 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) that pass through the mounting tube (14) are made of metal.

10. The automotive metal pipe concentric butt-joint laser welding machine according to claim 9, characterized in that: The approach-type boosting mechanism comprises a support frame (21), a transmission gear (26) and a second spring (28); the transmission gear (26) is key-connected to the middle of the screw rod (4), and the transmission gear (26) is meshedly connected to a toothed plate (25); the toothed plate (25) is horizontally suspended on the upper surface of the support seat (1), and the two sides of the toothed 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 toothed plate (25) is movably extended out of the support frame (21); a piston tube (22) is installed on the upper surface of the support frame (21), and the inner side of the open end of the piston tube (22) is seamlessly slidably connected to a piston rod (23); the piston tube (22) is connected to the piston rod (23) through two The gas delivery hose (24) is respectively connected to the interior of the two piston tubes (11), and the portion where the piston tube (22) is connected to the gas delivery hose (24) is between the end of the piston rod (23) extending into the piston tube (22) and the open end of the piston tube (22). The open end of the piston tube (22) is also connected to the middle of the piston rod (23) by a seamless sliding connection. The piston rod (23) is arranged on the end of the piston tube (22) outside and has a limit rod (27) coaxial therewith movably extended therein. The limit rod (27) is fixedly connected to the raised portion of the tooth plate (25), and a spring (28) is arranged between the raised portion of the tooth plate (25) and the open end of the piston tube (22) and is nested in the outer side of the limit rod (27).

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