Pipe fitting laser welding machine and using method thereof

Abstract

The invention provides a pipe fitting laser welding machine and a using method thereof, and relates to the technical field of laser welding, the pipe fitting laser welding machine comprises a base, two side fixing plates are symmetrically and vertically fixed to the two sides of the top of the base, a motor is fixed to the outer sides of the side fixing plates through mounting supports, and the axial part of an output shaft of the motor is located in the side fixing plates and rotationally mounted; an auxiliary structure is coaxially fixed at the end part of an output shaft of the motor; the auxiliary structure comprises a long shaft, by arranging the auxiliary structure, when a worker starts the motor to drive the pipeline to rotate and convey inert gas, the gas conveying pipe can stably convey gas to the four-way converging pipe, then the gas is conveyed to a welding area through the stretchable flexible exhaust pipe, and meanwhile the gas conveying pipe is matched with rotation of the turbulent flow main shaft; therefore, uniform distribution of the inert gas in the welding area can be achieved, a stable protection atmosphere is provided for welding, the diffusion mode is that the inert gas diffuses from the interior of the pipeline to the weld joint and can directly act on a welding pool and a nearby high-temperature area, and the stability of welding quality is ensured.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, and more specifically, relates to a laser welding machine for pipe fittings and its method of use. Background Technology

[0002] Laser welding machines are high-efficiency and precision welding equipment that use high-energy-density laser beams as heat sources. By focusing the laser beam onto the joint of the workpiece, the material is melted and a weld is formed. Compared with traditional welding methods, laser welding machines have advantages such as fast welding speed, small heat-affected zone, high weld quality, and easy automation. They are widely used in automobile manufacturing, aerospace, electronic components and other fields.

[0003] A search of Chinese patent publication number "CN116871676B" reveals an "improved laser welding machine". This welding machine uses a track frame to drive a laser welding head to weld the elliptical weld by a grinding wheel that travels along the trajectory of the elliptical weld. This ensures that the laser welding head is always in the same plane as the elliptical weld, thus enabling precise welding of the elliptical weld. Furthermore, the elastically sliding track frame ensures that the laser welding head is always within a certain range from the elliptical weld, thereby guaranteeing uniform welding quality throughout the elliptical weld.

[0004] Based on the above search and existing technology, it was found that: in practical applications, laser welding machines usually need to be used in conjunction with inert gases to improve welding stability. Although this laser welding machine can ensure the relative position of the laser welding head and the elliptical weld seam through the track frame to ensure welding accuracy, when using inert gases, the gas cannot diffuse from the inside to the outside in the welding area and cannot directly reach the core area of ​​the molten pool. As a result, the molten pool and the nearby high-temperature area are easily exposed to the air, and reactive gases such as oxygen have the opportunity to come into contact with it and react, generating impurities such as oxides and nitrides, which affect the welding quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a laser welding machine for pipe fittings and its method of use, thereby resolving the problems described above.

[0006] A laser welding machine for pipe fittings includes a base, on which two side fixing plates are symmetrically and vertically fixed on both sides of the top of the base. A motor is fixed to the outside of the side fixing plates by a mounting bracket. The axial portion of the output shaft of the motor is located inside the side fixing plates and is rotatably mounted.

[0007] An auxiliary structure is coaxially fixed to the end of the motor's output shaft.

[0008] The auxiliary structure includes a long shaft, part of which is located inside the side fixing plate and is rotatably mounted. A gas supply pipe is radially embedded inside the long shaft. One end of the gas supply pipe extends to the outer circumferential surface of the long shaft to form an L shape, and the other end extends to the end of the long shaft. A four-way manifold is fixedly connected to one side of the extended end of the long shaft. The four-way manifold is connected to a flexible exhaust pipe that can be stretched and deformed.

[0009] Preferably, the base has an adjustment structure inside, which includes a slide groove, a lead screw, a motor, and an internal thread transmission block. The slide groove is rectangular and extends along the length of the base. The lead screw is parallel to the slide groove and its two ends are rotatably fixed to the inner wall of the slide groove via bearings. The motor is fixed to the side wall of the base, and the motor output shaft is coaxially connected to the lead screw. The internal thread transmission block is slidably embedded in the slide groove and forms a threaded connection with the lead screw. When the motor is started, it can drive the lead screw to rotate inside the slide groove and generate threaded transmission with the internal thread transmission block, causing the internal thread transmission block to drive the side fixing plate on one side to move.

[0010] Preferably, the long shaft is provided with an internal support structure, which includes a driven link, an electric push rod, an active link, a transmission bar, an internal support plate, a connecting column, and a turbulence-inducing main shaft. The root of each group of driven links is mounted on the outer surface of the long shaft through a fixed seat, and the driven link can rotate on the fixed seat. The electric push rod is partially fixed inside the long shaft, and its output shaft axially penetrates the end face of the long shaft. The root of the active link is mounted on the end of the output shaft of the electric push rod through a fixed seat, and the active link can rotate on the fixed seat. The active link is parallel to the driven link. The transmission bar is rotatably installed between each group of driven links and the active link. The internal support plate is fixedly installed on the outside of the transmission bar. The connecting column is fixedly installed on the inside of the transmission bar. The connecting column is fixedly installed on the outer surface of the flexible exhaust pipe. The turbulence-inducing main shaft is fixedly installed on the side wall of the transmission bar.

[0011] Preferably, a sealing structure is fixedly installed on the circumferential surface of the long axis. The sealing structure includes a stretching annular membrane, a heat-resistant annular airbag, and a hose. The stretching annular membrane is fixedly installed on the circumferential surface of the long axis and is composed of multiple heat-resistant stretching silicone membranes, elastic metal strips, and an outer ring. The heat-resistant stretching silicone membranes and elastic metal strips are staggered and fixedly installed. The outer ring is located outside the heat-resistant stretching silicone membranes and elastic metal strips and is fixedly installed together. The outer ring is fixedly installed with an inner support plate. The stretching annular membrane is installed on the long axis in an arc shape. The heat-resistant annular airbag is fixedly installed on the circumferential surface of the outer ring and is fixedly installed with the inner support plate. The heat-resistant annular airbag can expand outward from the inner support plate. A hose is provided on the side wall of the heat-resistant annular airbag.

[0012] Preferably, the side wall of the side fixing plate is provided with an anti-winding structure, the anti-winding structure includes an air slip ring, the air slip ring includes a fixed ring and a moving ring, the moving ring can rotate on the fixed ring, and the hose and the air supply pipe are fixedly connected to the moving ring.

[0013] Preferably, the upper end of the base is provided with a cooling structure, which includes a roller frame assembly, a cooling roller, an extension shaft and a pulley. The roller frame assembly is fixedly installed above the base, the cooling roller is located inside the roller frame assembly and is rotatably installed, and an extension shaft is fixedly installed on the side wall of the cooling roller, with the extension shaft extending to the outside of the roller frame assembly.

[0014] Preferably, the output shaft and the extension shaft of one of the motors are provided with a transmission structure. The transmission structure includes pulleys and a synchronous belt is wound between the pulleys. The start of the motor can drive the extension shaft to rotate through the synchronous belt and the pulleys, so that the extension shaft drives the cooling roller to rotate between the roller frame assembly.

[0015] Preferably, the base sidewall is provided with a welding structure, the welding structure including a side plate, a laser welding robot and a welding head, the upper end of the side plate is provided with a laser welding robot, and the lower end of the laser welding robot is provided with a welding head.

[0016] A method for using a laser welding machine for pipe fittings includes the following steps:

[0017] S1: When in use, the staff first puts the pipe to be welded into the outside of the inner support structure, and then turns on the electric push rod. Its output shaft pushes the active connecting rod to move outward. Under the limiting action of the driven connecting rod and the transmission bar, multiple transmission bars drive the inner support plate to support the inner wall of the pipe outward. The inner support plate expands outward and backward to support the pipe and complete the pipe fixing. At the same time, the cooling roller is in contact with the pipe, and the staff connects the water cooling circulation port of the cooling roller to the external water cooling circulation equipment.

[0018] S2: The staff connects the gas delivery port of the gas conveyor and the air pump to the air inlet of the air slip ring. When the inner support structure expands outward and backward, the inner support plate drives the stretching annular membrane to stretch synchronously through the connecting column. Because the stretching annular membrane is arc-shaped, when stretched, the elastic metal strip drives the heat-resistant stretching silicone membrane to gradually straighten from the curved shape, so that the stretching annular membrane changes synchronously with the fixed size of the inner support plate. After the inner support plate is fixed, the air pump is turned on, and the gas enters the heat-resistant annular airbag through the hose. The heat-resistant annular airbag expands outward and touches the inner wall of the pipe to achieve a relative seal.

[0019] S3: Turn on the motor. Its output shaft drives the lead screw to rotate. The lead screw and the internal thread transmission block drive each other, causing the internal thread transmission block to drive the side fixed plate to slide along the slide groove. The inner support structure on one side fixed plate moves closer to the other side. When the pipe spacing on the two inner support structures meets the process welding gap, turn off the motor.

[0020] S4: Start the laser welding robot, adjust the welding head to the pipe welding position, then turn on the motor, its output shaft drives the long shaft to rotate, which in turn drives the pipe to rotate. The staff delivers inert gas to the welding area through the gas delivery pipe, the four-way junction pipe and the flexible exhaust pipe via the gas conveyor. At the same time, the turbulence main shaft rotates around the center of the long shaft to turbulent the inert gas between the two inner support structures. Then start the laser welding robot to perform welding.

[0021] S5: When the motors rotate, one of the motors drives the extension shaft to rotate through the pulley and synchronous belt. The extension shaft drives the cooling roller to rotate, and the cooling roller cools the welding position of the pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In this invention, by setting up an auxiliary structure, when the operator turns on the motor to drive the pipeline to rotate and transport inert gas, the gas delivery pipe can stably transport gas to the four-way junction pipe, and then send it to the welding area through the stretchable flexible exhaust pipe. At the same time, in conjunction with the rotation of the turbulence main shaft, the inert gas can be evenly distributed in the welding area, providing a stable protective atmosphere for welding. Moreover, this diffusion method, inert gas diffuses from inside the pipeline to the weld, which can directly act on the weld pool and the nearby high-temperature area, effectively reducing the contact between oxygen in the air and high-temperature metal, avoiding the reaction of these gases with the metal to generate impurities such as oxides and nitrides, thereby reducing the generation of welding defects such as porosity and cracks, ensuring the mechanical properties and corrosion resistance of the weld joint, and ensuring the stability of welding quality.

[0024] In this invention, by setting an internal support structure, after the operator turns on the electric push rod, its output shaft pushes the active connecting rod to move outward. Since the active connecting rod and the driven connecting rod are parallel and rotatably connected through the transmission bar, the driven connecting rod will rotate synchronously on the fixed seat, thereby driving the transmission bar together with the internal support plate to extend along the outward and rearward trajectory. This trajectory design allows the internal support plate to first extend outward and then conform to the inner wall of the pipe, which can adapt to pipes with different inner diameters from small to large.

[0025] In this invention, by fixing the turbulence main shaft to the side wall of the transmission bar, its position is adjusted synchronously with the inner support plate to adapt to the inner diameter of the pipe. When the pipe rotates under the drive of the motor, the turbulence main shaft rotates around the center of its long axis. During its rotation, it breaks the flow inertia of the inert gas, allowing the gas to form a more complex vortex in the welding area, so that the inert gas can more evenly wrap the pipe welding joint, further improving the comprehensiveness and uniformity of gas protection, thereby achieving reliable pipe fixation and efficient and uniform gas coverage in the welding area.

[0026] In this invention, by setting a sealing structure, when the inner support plate expands along the outward and rearward trajectory, the inner support plate will drive the outer ring fixed to it to move synchronously. Since the heat-resistant stretchable silicone membrane and the elastic metal strip of the stretchable annular membrane are interlaced and fixed and are installed in an arc shape, the elastic metal strip will be gradually straightened from a bent state, and the heat-resistant stretchable silicone membrane will also be stretched and deformed accordingly, so that the stretchable annular membrane can accurately follow the expansion range of the inner support plate to deform synchronously, and initially block the gas leakage channel.

[0027] In this invention, after the inner support plate is fixed in place, the operator turns on the air pump. The air pump continuously delivers gas to the inside of the heat-resistant annular airbag through a hose. The heat-resistant annular airbag gradually expands outward due to inflation until it completely touches the inner wall of the pipe. At this time, the heat-resistant annular airbag tightly wraps the inner wall of the pipe with its own elastic deformation, forming a double sealing barrier with the stretched annular membrane. At the same time, it minimizes the diffusion of inert gas from the welding area to other parts of the pipe, thereby achieving a relative seal of the welding area and providing a stable gas protection environment for the welding process.

[0028] In this invention, by setting up a cooling structure, when the motor drives the pipe to rotate for welding, the extension shaft drives the cooling roller to rotate synchronously and fit into the pipe welding position through the pulley and synchronous belt drive. Combined with water cooling circulation, the welding area can be cooled in time to prevent overheating from affecting the welding quality. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the base assembly connection structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the roller frame assembly connection structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the base assembly connection structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the long shaft assembly connection structure of the present invention;

[0034] Figure 6 This is a longitudinal sectional view of the present invention;

[0035] Figure 7 This is a schematic diagram of the internal support plate assembly connection structure of the present invention;

[0036] Figure 8 This is a three-dimensional structural diagram of the internal support structure of the present invention;

[0037] Figure 9 This is a schematic diagram of the four-way manifold combination connection structure of the present invention.

[0038] The diagram shows the correspondence between component names and their corresponding numbers in the attached drawings: 11. Base; 12. Side fixing plate; 13. Motor; 14. Long shaft; 15. Air supply pipe; 16. Four-way junction pipe; 17. Flexible exhaust pipe; 21. Slide groove; 22. Lead screw; 23. Motor; 24. Internal threaded transmission block; 31. Driven connecting rod; 32. Electric push rod; 33. Driving connecting rod; 34. Transmission bar; 35. Inner support plate; 36. Connector Column; 37. Turbidity main shaft; 41. Stretch annular membrane; 42. Heat-resistant annular airbag; 43. Hose; 51. Air slip ring; 52. Fixed ring; 53. Moving ring; 61. Roller frame assembly; 62. Cooling roller; 63. Extension shaft; 71. Pulley; 72. Synchronous belt; 81. Side plate; 82. Laser welding robot; 83. Welding head; 84. Heat-resistant stretch silicone membrane; 85. Elastic metal strip; 86. Outer ring. Detailed Implementation

[0039] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0040] Please see Figure 1 - Figure 9 The present invention provides a pipe laser welding machine, including a base 11, two side fixing plates 12 are symmetrically and vertically fixed on the top two sides of the base 11, and a motor 13 is fixed on the outside of the side fixing plates 12 by a mounting bracket. The axial part of the output shaft of the motor 13 is located inside the side fixing plate 12 and is rotatably mounted.

[0041] An auxiliary structure is coaxially fixed to the end of the output shaft of motor 13;

[0042] The auxiliary structure includes a long shaft 14, part of which is located inside the side fixing plate 12 and is rotatably mounted. A gas supply pipe 15 is radially embedded inside the long shaft 14. One end of the gas supply pipe 15 extends to the outer circumferential surface of the long shaft 14 to form an L shape, and the other end extends to the end of the long shaft 14. A four-way manifold 16 is fixedly connected to one side of the extended end of the long shaft 14. The four-way manifold 16 is connected to a flexible exhaust pipe 17 that can be stretched and deformed.

[0043] By setting up an auxiliary structure, when the operator turns on the motor 13 to drive the pipeline to rotate and transport inert gas, the gas supply pipe 15 can stably transport gas to the four-way junction pipe 16, and then send it to the welding area through the stretchable flexible exhaust pipe 17. At the same time, in conjunction with the rotation of the turbulence main shaft 37, the inert gas can be evenly distributed in the welding area, providing a stable protective atmosphere for welding. Moreover, this diffusion method, inert gas diffuses from inside the pipeline to the weld, which can directly act on the weld pool and the nearby high-temperature area, effectively reducing the contact between oxygen in the air and high-temperature metal, avoiding the reaction of these gases with the metal to generate impurities such as oxides and nitrides, thereby reducing the generation of welding defects such as porosity and cracks, ensuring the mechanical properties and corrosion resistance of the welded joint, and ensuring the stability of welding quality.

[0044] The base 11 has an adjustment structure inside, which includes a slide 21, a lead screw 22, a motor 23, and an internal thread transmission block 24. The slide 21 is rectangular and is opened along the length of the base 11. The lead screw 22 is arranged parallel to the slide 21. The two ends of the lead screw 22 are rotatably fixed to the inner wall of the slide 21 by bearings. The motor 23 is fixed to the side wall of the base 11. The output shaft of the motor 23 is coaxially connected to the lead screw 22. The internal thread transmission block 24 is slidably embedded in the slide 21 and forms a threaded installation with the lead screw 22. When the motor 23 is started, it can drive the lead screw 22 to rotate inside the slide 21 and generate threaded transmission with the internal thread transmission block 24, so that the internal thread transmission block 24 drives the side fixing plate 12 on one side to move.

[0045] By adjusting the slide groove 21, lead screw 22, motor 23 and internal thread transmission block 24 in the structure, after the operator turns on the motor 23, the thread transmission of the lead screw 22 and the internal thread transmission block 24 can drive the side fixing plate 12 to move along the slide groove 21, thereby adjusting the distance between the two inner support structures, so as to achieve precise control of the pipe welding gap and meet the process requirements.

[0046] The long shaft 14 is equipped with an internal support structure, which includes a driven connecting rod 31, an electric push rod 32, a driving connecting rod 33, a transmission bar 34, an internal support plate 35, a connecting column 36, and a turbulence-inducing main shaft 37. The root of each driven connecting rod 31 is mounted on the outer surface of the long shaft 14 via a fixed seat, and the driven connecting rod 31 can rotate on the fixed seat. The electric push rod 32 is partially fixed inside the long shaft 14, and its output shaft axially penetrates the end face of the long shaft 14. The root of the driving connecting rod 33 is mounted via a fixed seat. At the end of the output shaft of the electric push rod 32, the active connecting rod 33 can rotate on the fixed seat. The active connecting rod 33 is parallel to the driven connecting rod 31. The transmission bar 34 is rotatably installed between each set of driven connecting rods 31 and active connecting rods 33. The inner support plate 35 is fixedly installed on the outside of the transmission bar 34. The connecting column 36 is fixedly installed on the inside of the transmission bar 34. The connecting column 36 is fixedly installed on the outer surface of the flexible exhaust pipe 17. The turbulence main shaft 37 is fixedly installed on the side wall of the transmission bar 34.

[0047] By setting an internal support structure, after the operator opens the electric push rod 32, its output shaft pushes the active connecting rod 33 to move outward. Since the active connecting rod 33 is parallel to the driven connecting rod 31 and is rotatably connected through the transmission bar 34, the driven connecting rod 31 will rotate synchronously on the fixed seat, thereby driving the transmission bar 34 together with the internal support plate 35 to expand along the outward and rearward trajectory. This trajectory design allows the internal support plate 35 to first extend outward and then conform to the inner wall of the pipe, which can adapt to pipes with different inner diameters from small to large.

[0048] By fixing the turbulence main shaft 37 to the side wall of the transmission bar 34, its position will be adjusted synchronously with the inner support plate 35 to adapt to the inner diameter of the pipe. When the pipe rotates under the drive of the motor 13, the turbulence main shaft 37 will rotate around the center of the long axis 14. During its rotation, it will break the flow inertia of the inert gas, allowing the gas to form a more complex vortex in the welding area, so that the inert gas can wrap the pipe welding area more evenly, further improving the comprehensiveness and uniformity of gas protection, thereby achieving reliable pipe fixation and efficient and uniform gas coverage in the welding area.

[0049] A sealing structure is fixedly installed on the circumferential surface of the long shaft 14. The sealing structure includes a stretching annular membrane 41, a heat-resistant annular airbag 42, and a hose 43. The stretching annular membrane 41 is fixedly installed on the circumferential surface of the long shaft 14. The stretching annular membrane 41 is composed of multiple heat-resistant stretching silicone membranes 84, elastic metal strips 85, and an outer ring 86. The heat-resistant stretching silicone membranes 84 and elastic metal strips 85 are staggered and fixedly installed. The outer ring 86 is located outside the heat-resistant stretching silicone membranes 84 and elastic metal strips 85 and is fixedly installed together. The outer ring 86 is fixedly installed with the inner support plate 35. The stretching annular membrane 41 is installed on the long shaft 14 in an arc shape. The heat-resistant annular airbag 42 is fixedly installed on the circumferential surface of the outer ring 86. The heat-resistant annular airbag 42 is fixedly installed with the inner support plate 35. The heat-resistant annular airbag 42 can expand outward from the inner support plate 35. A hose 43 is provided on the side wall of the heat-resistant annular airbag 42.

[0050] By setting a sealing structure, when the inner support plate 35 expands along the outward and rearward trajectory, the inner support plate 35 will drive the outer ring 86 fixed to it to move synchronously. Since the heat-resistant stretch silicone membrane 84 and the elastic metal strip 85 of the stretch annular membrane 41 are interlaced and installed in an arc shape, the elastic metal strip 85 will be gradually straightened from a bent state, and the heat-resistant stretch silicone membrane 84 will also be stretched and deformed accordingly, so that the stretch annular membrane 41 can accurately follow the expansion range of the inner support plate 35 to deform synchronously, and initially block the gas leakage channel.

[0051] After the inner support plate 35 is fixed in place, the staff turns on the air pump. The air pump continuously delivers gas to the heat-resistant annular airbag 42 through the hose 43. The heat-resistant annular airbag 42 gradually expands outward due to inflation until it completely touches the inner wall of the pipe. At this time, the heat-resistant annular airbag 42 tightly wraps the inner wall of the pipe with its own elastic deformation, forming a double sealing barrier with the stretching annular membrane 41. At the same time, it minimizes the diffusion of inert gas from the welding area to other parts of the pipe, thereby achieving a relative seal of the welding area and providing a stable gas protection environment for the welding process.

[0052] The side wall of the side fixing plate 12 is provided with an anti-winding structure, which includes an air slip ring 51. The air slip ring 51 includes a fixed ring 52 and a moving ring 53. The moving ring 53 can rotate on the fixed ring 52. The hose 43 and the air supply pipe 15 are fixedly connected to the moving ring 53.

[0053] By setting an anti-winding structure, when the pipe is rotated for welding, the moving ring 53 rotates with the long axis 14 while the fixed ring 52 remains fixed, which can prevent the hose 43 from getting tangled with the gas supply pipe 15, thereby achieving smooth and stable gas delivery and ensuring continuous welding process.

[0054] The upper end of the base 11 is provided with a cooling structure, which includes a roller frame assembly 61, a cooling roller 62, an extension shaft 63, and a pulley 71. The roller frame assembly 61 is fixedly installed above the base 11. The cooling roller 62 is located inside the roller frame assembly 61 and is rotatably installed. An extension shaft 63 is fixedly installed on the side wall of the cooling roller 62. The extension shaft 63 extends to the outside of the roller frame assembly 61. The output shaft of one of the motors 13 and the circumferential surface of the extension shaft 63 are provided with a transmission structure. The transmission structure includes a pulley 71. A synchronous belt 72 is wound between the pulleys 71. The starting of the motor 13 can drive the extension shaft 63 to rotate through the synchronous belt 72 and the pulleys 71, so that the extension shaft 63 drives the cooling roller 62 to rotate between the roller frame assembly 61.

[0055] By setting up a cooling structure, when the motor 13 drives the pipe to rotate for welding, the extension shaft 63 drives the cooling roller 62 to rotate synchronously and fit into the pipe welding position through the pulley 71 and synchronous belt 72. Combined with water cooling circulation, the welding area can be cooled in time to prevent overheating from affecting the welding quality.

[0056] The base 11 has a welding structure on its side wall. The welding structure includes a side plate 81, a laser welding robot 82, and a welding head 83. The upper end of the side plate 81 is equipped with a laser welding robot 82, and the end of the laser welding robot 82 is equipped with a welding head 83.

[0057] By using the side plate 81, laser welding robot 82, and welding head 83 in the welding structure, after the operator adjusts the welding head 83 to the welding position, and with the cooperation of pipe rotation and inert gas protection, precise operation of pipe welding can be achieved, thereby improving welding efficiency and quality.

[0058] Working principle:

[0059] In the first step, when using the device, the staff first inserts the pipe to be welded into the outer side of the inner support structure, and then turns on the electric push rod 32. Its output shaft pushes the active connecting rod 33 to move outward. With the limiting effect of the driven connecting rod 31 and the transmission bar 34, multiple transmission bars 34 together drive the inner support plate 35 to expand and support it in the outward and rearward direction, thus completing the pipe fixing. At the same time, the cooling roller 62 is in contact with the pipe, and the staff simultaneously connects the water cooling circulation port of the cooling roller 62 to the external water cooling circulation equipment to prepare for the subsequent cooling process.

[0060] The second step involves connecting the gas delivery machine and air pump to the air inlet of the air slip ring 51 after the pipeline is fixed. When the inner support structure expands along the predetermined trajectory, the inner support plate 35 drives the stretching annular membrane 41 to stretch synchronously through the connecting column 36. Since the stretching annular membrane 41 has an arc-shaped structure, when stretched, the elastic metal strip 84 drives the heat-resistant stretching silicone membrane 85 to gradually straighten from the curved shape, so that the stretching annular membrane 41 can change synchronously with the fixed size of the inner support plate 35. After the inner support plate 35 is fixed in place, the staff turns on the air pump, and the gas enters the heat-resistant annular air bag 42 through the hose 43. The heat-resistant annular air bag 42 expands outward and touches the inner wall of the pipeline, thereby achieving a relative seal and creating a good sealing environment for welding operations.

[0061] Third, after the sealing process is completed, turn on the motor 23. Its output shaft drives the lead screw 22 to rotate. The lead screw 22 and the internal thread transmission block 24 are threadedly driven, which drives the internal thread transmission block 24 to drive the side fixing plate 12 to slide along the slide groove 21, so that the inner support structure on one side fixing plate 12 moves closer to the other side. When the distance between the pipes on the two inner support structures meets the process welding gap, turn off the motor 23 to precisely control the relative position of the pipes.

[0062] Fourth, after the pipeline position is properly adjusted, the laser welding robot 82 is turned on, and the welding head 83 is adjusted to the pipeline welding position. Then, the motor 13 is turned on, and its output shaft drives the long shaft 14 to rotate, which in turn drives the pipeline to rotate synchronously. At the same time, the staff delivers inert gas to the welding area through the gas delivery pipe 15, the four-way junction pipe 16 and the flexible exhaust pipe 17 via the gas conveyor. During this process, the turbulence main shaft 37 rotates around the center of the long shaft 14 to turbulent the inert gas between the two inner support structures to ensure that the inert gas is evenly distributed. After all preparations are completed, the laser welding robot 82 is officially turned on to carry out the welding operation.

[0063] Fifth step: While the motor 13 rotates to drive the pipe welding, one of the motors 13 drives the extension shaft 63 to rotate through the pulley 71 and the synchronous belt 72. The extension shaft 63 further drives the cooling roller 62 to rotate. The cooling roller 62 continuously cools the pipe welding position to ensure the welding quality.

[0064] Gas conveyor: It is a device used to convey gas. It mainly consists of a gas source interface, a flow control device, and a power unit (such as a fan or compressor). In this pipeline welding operation, it can stably convey inert gas through the gas delivery pipe 15, the four-way manifold 16 and the flexible exhaust pipe 17 to the pipeline welding area, so as to provide an inert gas protective atmosphere for the welding area.

[0065] Air pump: It is a device that uses mechanical motion to pressurize and transport gas. It mainly consists of an air inlet, an air outlet, and a pump body. The air pump can transport gas into the heat-resistant annular air bag 42 through the hose 43, causing the heat-resistant annular air bag 42 to expand and press against the inner wall of the pipe, thereby achieving a relative sealing effect.

[0066] Water-cooled circulation equipment: This is a device that uses the circulation of water for heat exchange. It mainly consists of a water tank, water pump, cooler (such as a radiator), circulation pipe, temperature control device, etc. During the welding process, after it is connected to the water-cooled circulation port of the cooling roller 62, it can continuously provide cold circulation for the cooling roller 62.

[0067] Gas slip ring 51: This is a device used to transfer gas in rotating equipment. It mainly consists of a fixed ring 52, a rotating ring 53, and a gas channel. The fixed ring 52 is fixed and stationary, while the rotating ring 53 can rotate with the rotating parts. The two maintain a good gas seal and communication. In this working scenario, it can connect to a gas conveyor and a gas pump to ensure stable gas delivery and prevent entanglement due to equipment rotation. This ensures smooth and stable gas delivery and guarantees continuous welding process.

[0068] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A laser welding machine for pipe fittings, comprising a base (11), characterized in that: The base (11) has two side fixing plates (12) symmetrically and vertically fixed on both sides of the top. The motor (13) is fixed on the outside of the side fixing plates (12) by a mounting bracket. The axial part of the output shaft of the motor (13) is located inside the side fixing plates (12) and is rotatably installed. An auxiliary structure is coaxially fixed at the end of the output shaft of the motor (13); The auxiliary structure includes a long shaft (14), part of which is located inside the side fixing plate (12) and is rotatably mounted. A gas supply pipe (15) is radially embedded inside the long shaft (14). One end of the gas supply pipe (15) extends to the outer circumferential surface of the long shaft (14) to form an L shape, and the other end extends to the end of the long shaft (14). A four-way manifold (16) is fixedly connected to one side of the extended end of the long shaft (14). The four-way manifold (16) is connected to a stretchable and deformable flexible exhaust pipe (17).

2. The pipe fitting laser welding machine as described in claim 1, characterized in that, The base (11) is provided with an adjustment structure, which includes a slide groove (21), a lead screw (22), a motor (23), and an internal thread transmission block (24). The slide groove (21) is rectangular along the length of the base (11). The lead screw (22) is arranged parallel to the slide groove (21). The two ends of the lead screw (22) are rotatably fixed to the inner wall of the slide groove (21) by bearings. The motor (23) is fixed to the side wall of the base (11). The output shaft of the motor (23) is coaxially connected to the lead screw (22). The internal thread transmission block (24) is slidably embedded in the slide groove (21) and forms a threaded installation with the lead screw (22). When the motor (23) is started, it can drive the lead screw (22) to rotate inside the slide groove (21) and generate a threaded transmission with the internal thread transmission block (24), so that the internal thread transmission block (24) drives the side fixing plate (12) on one side to move.

3. The pipe fitting laser welding machine as described in claim 2, characterized in that, The long shaft (14) is provided with an inner support structure, which includes a driven connecting rod (31), an electric push rod (32), an active connecting rod (33), a transmission bar (34), an inner support plate (35), a connecting column (36), and a turbulence main shaft (37). The root of each set of driven connecting rods (31) is installed on the outer surface of the long shaft (14) through a fixed seat, and the driven connecting rod (31) can rotate on the fixed seat. The electric push rod (32) is partially fixed inside the long shaft (14), and the output shaft axially penetrates the end face of the long shaft (14).

4. The pipe fitting laser welding machine as described in claim 3, characterized in that, The root of the active connecting rod (33) is mounted on the end of the output shaft of the electric push rod (32) via a fixed seat. The active connecting rod (33) can rotate on the fixed seat. The active connecting rod (33) is parallel to the driven connecting rod (31). The transmission bar (34) is rotatably installed between each set of driven connecting rods (31) and active connecting rods (33). The inner support plate (35) is fixedly installed on the outside of the transmission bar (34). The connecting column (36) is fixedly installed on the inside of the transmission bar (34). The connecting column (36) is fixedly installed on the outer surface of the flexible exhaust pipe (17). The turbulence main shaft (37) is fixedly installed on the side wall of the transmission bar (34).

5. A laser welding machine for pipe fittings as described in any one of claims 1-2, characterized in that, A sealing structure is fixedly installed on the circumferential surface of the long shaft (14). The sealing structure includes a stretch annular membrane (41), a heat-resistant annular airbag (42), and a hose (43). The stretch annular membrane (41) is fixedly installed on the circumferential surface of the long shaft (14). The stretch annular membrane (41) is composed of multiple heat-resistant stretch silicone membranes (84), elastic metal strips (85), and an outer ring (86). The heat-resistant stretch silicone membranes (84) and elastic metal strips (85) are staggered and fixedly installed. The outer ring (86) is located on the heat-resistant stretch silicone membranes (84). The outer ring (86) and the inner support plate (35) are fixedly installed together on the outside of the elastic metal strip (85). The outer ring (86) and the inner support plate (35) are fixedly installed together. The stretching annular membrane (41) is installed in an arc shape on the long axis (14). The heat-resistant annular airbag (42) is fixedly installed on the circumferential surface of the outer ring (86). The heat-resistant annular airbag (42) and the inner support plate (35) are fixedly installed together. The heat-resistant annular airbag (42) can expand on the inner support plate (35) to the outside of the inner support plate (35). The heat-resistant annular airbag (42) is provided with a hose (43) on the side wall.

6. The pipe fitting laser welding machine as described in claim 5, characterized in that, The side wall of the side fixing plate (12) is provided with an anti-winding structure, which includes an air slip ring (51). The air slip ring (51) includes a fixed ring (52) and a moving ring (53). The moving ring (53) can rotate on the fixed ring (52). The hose (43) and the air supply pipe (15) are fixedly connected to the moving ring (53).

7. The laser welding machine for pipe fittings as described in claim 6, characterized in that, The upper end of the base (11) is provided with a cooling structure, which includes a roller frame assembly (61), a cooling roller (62), an extension shaft (63), and a pulley (71). The roller frame assembly (61) is fixedly installed above the base (11). The cooling roller (62) is located inside the roller frame assembly (61) and is rotatably installed. An extension shaft (63) is fixedly installed on the side wall of the cooling roller (62), and part of the extension shaft (63) extends to the outside of the roller frame assembly (61).

8. The pipe fitting laser welding machine as described in claim 7, characterized in that, One of the motors (13) has a transmission structure on the circumferential surface of its output shaft and extension shaft (63). The transmission structure includes pulleys (71) and a synchronous belt (72) is wound between the pulleys (71). The motor (13) can be started by driving the extension shaft (63) to rotate through the synchronous belt (72) and the pulleys (71), so that the extension shaft (63) drives the cooling roller (62) to rotate between the roller frame group (61).

9. A laser welding machine for pipe fittings as described in any one of claims 1-2, characterized in that, The base (11) has a welding structure on its side wall. The welding structure includes a side plate (81), a laser welding robot (82), and a welding head (83). The upper end of the side plate (81) is provided with a laser welding robot (82), and the end of the laser welding robot (82) is provided with a welding head (83).

10. A method of using a pipe fitting laser welding machine, applied to the pipe fitting laser welding machine as described in claim 9, characterized in that, Includes the following steps: S1: When in use, the staff first puts the pipe to be welded into the outside of the inner support structure, and then turns on the electric push rod (32). Its output shaft pushes the active connecting rod (33) to move outward. Under the limiting action of the driven connecting rod (31) and the transmission bar (34), multiple transmission bars (34) together drive the inner support plate (35) to support the inner wall of the pipe outward. The inner support plate (35) extends outward and backward to support the pipe, thus completing the pipe fixing. At the same time, the cooling roller (62) is in contact with the pipe. The staff connects the water cooling circulation port of the cooling roller (62) to the external water cooling circulation equipment. S2: The staff connects the gas delivery port of the gas conveyor and the air pump to the air inlet of the air slip ring (51). When the inner support structure expands outward and backward, the inner support plate (35) drives the stretching annular membrane (41) to stretch synchronously through the connecting column (36). Because the stretching annular membrane (41) is arc-shaped, when stretched, the elastic metal strip (84) drives the heat-resistant stretching silicone membrane (85) to gradually straighten from the curved shape, so that the stretching annular membrane (41) changes synchronously with the fixed size of the inner support plate (35). After the inner support plate (35) is fixed, the air pump is turned on, and the gas enters the heat-resistant annular airbag (42) through the hose (43). The heat-resistant annular airbag (42) expands outward and touches the inner wall of the pipe to achieve relative sealing. S3: Turn on the motor (23), its output shaft drives the lead screw (22) to rotate, the lead screw (22) and the internal thread transmission block (24) are threadedly driven, so that the internal thread transmission block (24) drives the side fixing plate (12) to slide along the slide groove (21), and the inner support structure on one side fixing plate (12) moves closer to the other side. When the distance between the pipes on the two inner support structures meets the process welding gap, turn off the motor (23); S4: Start the laser welding robot (82), adjust the welding head (83) to the pipe welding position, then start the motor (13), its output shaft drives the long shaft (14) to rotate, which in turn drives the pipe to rotate. The staff delivers inert gas to the welding area through the gas delivery pipe (15), the four-way junction pipe (16) and the flexible exhaust pipe (17) via the gas conveyor. At the same time, the turbulence main shaft (37) rotates around the center of the long shaft (14) to turbulent the inert gas between the two inner support structures. Then start the laser welding robot (82) to perform welding. S5: When the motor (13) rotates, one of the motors (13) drives the extension shaft (63) to rotate through the pulley (71) and the synchronous belt (72). The extension shaft (63) drives the cooling roller (62) to rotate, and the cooling roller (62) cools the pipe welding position.

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