Full-automatic stainless steel pipe machining precision argon arc welding equipment

Abstract

The application discloses a kind of full-automatic stainless steel pipe processing precision argon arc welding equipment, belong to stainless steel pipe processing technical field;It includes base, the welding assembly and internal protection component are fixedly installed on the base, the internal protection component includes pump body fixedly installed on base, the output end of the pump body is fixedly installed with first hose, the one end of the first hose away from pump body is fixedly connected with straight-through pipe, the hydraulic cylinder is fixedly installed on the base, and the output end of the straight-through pipe and the hydraulic cylinder is fixedly connected.The internal protection component is kept synchronous rotation with the external welding gun head, and the protection gas is concentrated and aligned with the root position of the weld in real time. The whole pipeline lumen does not need to be filled with high-flow argon, only the local area of the weld is supplied with argon, the argon concentration at the root position of the weld is improved, the argon consumption is significantly reduced under the premise of ensuring the protection effect, and the production cost is saved.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe processing technology, and in particular to a fully automatic precision argon arc welding device for stainless steel pipe processing. Background Technology

[0002] During the welding process of stainless steel pipes, the protection conditions for stainless steel pipe welding are very strict. Stainless steel contains chromium. When the inner and outer surfaces of the weld are exposed to air under the high temperature of welding, chromium will oxidize and generate a gray-black or blue-purple oxide layer, which will greatly reduce the corrosion resistance of the weld and easily cause defects such as weld embrittlement, porosity and cracks. Therefore, argon gas protection is required for both the inner and outer surfaces of the weld during welding.

[0003] In existing large-diameter stainless steel pipe track welding processes, the inner wall protection mostly relies on argon purging of the entire pipe cavity. This requires a continuous flow of argon gas throughout the pipe, resulting in high argon consumption, significant gas waste, and high operating costs. Conventional protection devices have a fixed gas supply flow rate, making it impossible to dynamically adjust the argon supply according to the welding sequence. Furthermore, it is difficult to achieve precise synchronous rotation between the shielding gas nozzle and the external welding torch, leading to insufficient argon concentration at the weld root and a tendency for inner wall oxidation. Additionally, stainless steel has low thermal conductivity, resulting in slow weld cooling and prolonged exposure to the sensitization temperature range, which can easily cause intergranular corrosion. Existing equipment lacks an active heat dissipation structure for the weld root, relying solely on natural cooling. This results in a long cooling period for the high-temperature weld after welding, affecting the weld microstructure and production cycle. Moreover, existing equipment is difficult to adapt to different weld sizes, exhibiting poor versatility. Therefore, this paper proposes a fully automated precision argon arc welding device for stainless steel pipe processing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a fully automatic precision argon arc welding equipment for stainless steel pipe processing.

[0005] The present invention adopts the following technical solution:

[0006] A fully automatic precision argon arc welding device for stainless steel pipe processing includes a base on which welding components and internal protective components are fixedly mounted.

[0007] The internal protection assembly includes a pump body fixedly mounted on a base. A first hose is fixedly mounted at the output end of the pump body. A straight pipe is fixedly connected to the end of the first hose away from the pump body. A hydraulic cylinder is fixedly mounted on the base. The straight pipe and the output end of the hydraulic cylinder are fixedly connected. A fixed cover is fixedly connected to the end of the straight pipe. An isolation cover 7 is fixedly connected inside the fixed cover through multiple first connecting rods. A control cover is slidably mounted on the fixed cover. A slow-speed motor is fixedly mounted inside the isolation cover 7. A first gear is fixedly connected to the output shaft of the slow-speed motor. A three-way pipe is rotatably connected to the isolation cover 7. A second gear is fixedly sleeved on the three-way pipe. The first gear and the second gear mesh with each other. A telescopic pipe is fixedly connected to one output end of the three-way pipe. The internal protection assembly also includes a switch control assembly, which can control the switching of the other output end of the three-way pipe.

[0008] Preferably, the switch control assembly includes a piston plate slidably installed inside a three-way pipe. A fixing plate is fixedly connected to the end of the three-way pipe via multiple third connecting rods. A threaded rod is fixedly connected to the outside of the fixing plate. A threaded cylinder is threadedly sleeved on the threaded rod. The threaded cylinder and the control cover are slidably connected. A rotating ring is rotatably sleeved on the threaded cylinder. The rotating ring is fixedly connected to the piston plate via multiple fourth connecting rods.

[0009] Preferably, a limiting rod is fixedly connected to the outside of the rotating ring, the limiting rod is rotatably connected to a second connecting rod, the telescopic tube is fixedly sleeved with a fixing ring, and the second connecting rod and the telescopic tube are rotatably connected.

[0010] Preferably, a rotating head is fixedly connected to the end of the telescopic tube via a third flexible hose, a clamping plate is fixedly connected to the telescopic tube, the clamping plate is rotatably connected to the rotating head via a clamping rod, a torsion spring is fixedly connected between the clamping plate and the rotating head, a third gear is fixedly connected to the second connecting rod, a third rack is slidably connected to the fixing ring, the third gear and the third rack are meshed, a lifting plate is fixedly connected to the third rack, multiple protrusions are fixedly connected to the lifting plate, and a stop block is fixedly connected to the outside of the rotating head, with the stop block and the protrusions being positioned opposite each other.

[0011] Preferably, an inclined ring is fixedly connected to the outside of the rotating ring, and the inclined ring is positioned opposite to the fixed cover and the control cover.

[0012] Preferably, the fixed cover is fixedly connected with multiple mounting bolts, the control cover has multiple mounting holes, the position and number of the mounting bolts are opposite to the mounting holes, and the mounting bolts pass through the mounting holes. Each mounting bolt is threaded with two mounting nuts, and the two mounting nuts are located on both sides of the control cover and abut against the control cover.

[0013] Preferably, the control cover has a sliding groove, and a sliding rod is slidably connected in the sliding groove, and the sliding rod is fixedly connected to the threaded cylinder.

[0014] The beneficial effects of this invention are:

[0015] 1. First, the internal protective components rotate synchronously with the external welding gun head, and the protective gas is concentrated at the root of the weld being welded in real time. It is not necessary to fill the entire pipeline cavity with argon at a large flow rate. Argon is only supplied to a local area of ​​the weld, increasing the argon concentration at the root of the weld. While ensuring the protective effect, argon consumption is significantly reduced, saving production costs.

[0016] 2. Secondly, during the welding process, the piston plate gradually opens the gas path, and the argon flow rate gradually increases to the working flow rate; after the welding is completed, the gas path is adjusted in conjunction with the mechanism; at the same time, the inclined ring moves with the mechanism in a spiral motion, dynamically adjusting the opening and closing degree of the gas outlet gap between the fixed cover and the control cover, realizing automatic switching of flow rate during pre-purging and welding stages, reducing ineffective leakage of argon gas during non-welding stages, and improving argon gas utilization efficiency.

[0017] 3. Finally, after welding is completed, the telescopic tube moves closer to the stainless steel pipe wall to reduce the distance between the jet nozzle and the weld root, increase the impact force of the argon gas flow, accelerate heat dissipation at the weld root by relying on convection heat transfer, shorten the high-temperature residence time of the weld in the sensitization temperature range, and reduce the risk of intergranular corrosion. Moreover, during this process, after welding is completed, the drive rotating head swings, and the argon gas flow sweeps multiple areas of the weld, further improving the overall cooling uniformity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention;

[0019] Figure 2 This is a schematic diagram of the internal protective component in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention.

[0020] Figure 3 This is a schematic diagram of the structure of the fixing cover in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention;

[0021] Figure 4 This is a schematic diagram of the internal connection of the fixed cover in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention.

[0022] Figure 5 This is a cross-sectional view of the fixed cover connection in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention.

[0023] Figure 6This is a cross-sectional view of the fixed cover from another angle in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention.

[0024] Figure 7 This is a schematic diagram of the piston plate connection in a precision argon arc welding device for fully automatic stainless steel pipe processing proposed in this invention.

[0025] Figure 8 This is a schematic diagram of the rotating head in a precision argon arc welding device for fully automatic stainless steel pipe processing proposed in this invention.

[0026] Figure 9 This is a schematic diagram of the connection between the limiting rod and the second connecting rod in a precision argon arc welding equipment for fully automatic stainless steel pipe processing proposed in this invention.

[0027] Figure 10 for Figure 9 Enlarged view of the structure at point A in the middle.

[0028] In the diagram: 1. Base, 2. Pump body, 3. First hose, 4. Straight pipe, 5. Hydraulic cylinder, 6. Fixed cover, 7. Isolation cover, 8. First connecting rod, 9. Control cover, 10. Slow speed motor, 11. First gear, 12. T-pipe, 13. Second gear, 14. Telescopic pipe, 15. Piston plate, 16. Third connecting rod, 17. Fixed plate, 18. Threaded rod, 19. Threaded cylinder, 20. Rotating ring, 21. Fourth connecting rod, 22. Second connecting rod, 23. Fixed ring, 24. Rotating head, 25. Clamping plate, 26. Clamping rod, 27. Torsion spring, 28. Limiting rod, 29. Third gear, 30. Abutment, 31. Inclined ring, 32. Mounting bolt, 33. Isolation cover 7, 34. Mounting nut, 35. Slide groove, 36. Slide rod, 37. Third rack, 38. Lifting plate, 39. Protrusion. Detailed Implementation

[0029] See Figures 1-10 A fully automatic precision argon arc welding device for stainless steel pipe processing includes a base 1, on which welding components and an internal protective component are fixedly mounted. A power component that drives the welding components and the internal protective component to rotate synchronously is also fixedly mounted on the base 1.

[0030] The welding assembly includes a welding power source fixedly mounted on a base 1, a ring track fixedly mounted on the base 1, a gear ring fixedly mounted inside the track, a traveling trolley matched and mounted on the ring track, a welding torch fixedly mounted on the traveling trolley, a servo motor fixedly mounted on the traveling trolley, and a drive gear fixedly sleeved on the output shaft of the servo motor, with the drive gear meshing with the gear ring.

[0031] When welding is required, start the servo motor, which drives the drive gear to rotate. Since the circular track and gear ring are fixedly connected to the base 1, when the drive gear rotates, it will drive the entire trolley to move in a circle along the circular track. The trolley drives the welding gun head to move, and the welding gun head can be started to perform the welding operation.

[0032] Secondly, a transport assembly is also fixedly installed on the base 1. The transport assembly includes multiple sets of transport motors fixedly installed on the base 1. Each set of transport motors has two motors. A rotating wheel is fixedly sleeved on the output shaft of each transport motor. Multiple fixed frames are fixedly installed on the base. The output shaft is rotatably sleeved in the fixed frame and a limit frame is rotatably sleeved in the fixed frame. A threaded rod is threadedly connected to the fixed frame. A pressing plate is rotatably connected to the threaded rod in the fixed frame.

[0033] Before welding, insert the stainless steel tube to be welded between the two rotating wheels in each group, rotate the threaded rod, which moves the extrusion plate. The extrusion plate and the limit frame abut against each other, reducing the possibility of damage to the output shaft. Start the transport motor, which drives the output shaft and the rotating wheels to rotate. The two transport motors in each group rotate in opposite directions. The rotating wheels abut against the stainless steel tube, which in turn moves the stainless steel tube and transports it to the vicinity of the welding gun head. Then, place another stainless steel tube into another transport assembly and start the transport motor again until the two stainless steel tubes are in front of each other. Then, the welding operation can begin.

[0034] The internal protection component includes a pump body 2 fixedly mounted on a base 1. A first hose 3 is fixedly mounted on the output end of the pump body 2. A straight pipe 4 is fixedly connected to the end of the first hose 3 away from the pump body 2. A hydraulic cylinder 5 is fixedly mounted on the base 1. The straight pipe 4 and the output end of the hydraulic cylinder 5 are fixedly connected. A fixed cover 6 is fixedly connected to the end of the straight pipe 4. An isolation cover 7 is fixedly connected inside the fixed cover 6 through multiple first connecting rods 8. A control cover 9 is slidably mounted on the fixed cover 6. A slow speed motor 10 is fixedly mounted inside the isolation cover 7. A first gear 11 is fixedly connected to the output shaft of the slow speed motor 10. A three-way pipe 12 is rotatably connected to the isolation cover 7. A second gear 13 is fixedly sleeved on the three-way pipe 12. The first gear 11 and the second gear 13 mesh with each other. A telescopic pipe 14 is fixedly connected to one of the output ends of the three-way pipe 12. The internal protection component also includes a switch control component, which can control the switch on the other output end of the three-way pipe 12.

[0035] First, during the welding process, due to the special nature of stainless steel pipes, which are mainly composed of chromium, chromium will be oxidized when exposed to air during high-temperature welding, forming a gray-black or blue-purple oxide layer. This oxide layer will significantly reduce the corrosion resistance of the weld and cause the weld to become brittle, making it prone to porosity and cracks. Therefore, during welding, it is necessary to purify the inner and outer sides of the stainless steel pipe with argon.

[0036] For the outer side, the welding torch tip automatically emits argon gas for protection. For the inner side, activating pump 2 causes argon gas to enter the fixed cover 6 along the direction of the first flexible tube 3-straight pipe 4. Figure 5 As shown, there are two different transport routes for the argon gas that just enters the fixed shroud 6. First, there is a certain gap between the fixed shroud 6 and the isolation shroud 7, so the argon gas flows through the gap between the fixed shroud 6 and the isolation shroud 7, and then flows out completely from the fixed shroud 6 through the gap between the fixed shroud 6 and the control shroud 9. The gap between the fixed shroud 6 and the control shroud 9 is opposite to the weld. When the argon gas is completely discharged from the fixed shroud 6 and moves to the outside of the weld 2, the argon gas will squeeze out the air near the weld.

[0037] Secondly, the argon gas entering the fixed shroud 6 will enter the three-way pipe 12 and flow along the direction of the three-way pipe 12, so as to... Figure 5 From the perspective of the three-way pipe 12, when the opening on the left side of the three-way pipe 12 is closed, the argon gas entering the three-way pipe 12 will enter the telescopic pipe 14 and flow along the direction of the telescopic pipe 14. The telescopic pipe 14 is positioned opposite the gap formed between the fixed cover 6 and the control cover 9. The argon gas ejected from the telescopic pipe 14 will also be discharged between the fixed cover 6 and the control cover 9, but it will increase the argon gas concentration at the position opposite the opening of the telescopic pipe 14. During the welding process, the slow motor 10 and the drive motor are started at the same time, and the speeds of the slow motor 10 and the drive motor are exactly the same. During the welding process, the slow motor 10 drives the three-way pipe 12 to rotate through the first gear 11 and the second gear 13. The three-way pipe 12 drives the telescopic pipe 14 to rotate. During this process, the welding torch head and the telescopic pipe 14 rotate synchronously, which can increase the argon gas concentration at the welding position, reduce unnecessary waste, and improve the protection effect.

[0038] After the slow-speed motor 10 and the drive motor are started, the welding gun head will not be activated for a short period of time. The purpose of this period is mainly to remove air near the weld. The welding gun head will only be activated when there is almost no air or the air content is extremely low near the weld. After the welding gun head has rotated a full circle along the circular guide rail with the traveling trolley, the welding gun head is turned off. At this time, the welding operation between the two stainless steel pipes is completed. However, the slow-speed motor 10 and the drive motor will not be turned off at this time. Instead, the slow-speed motor 10 and the drive motor will be allowed to run for a period of time before being turned off. The purpose of this period of time is mainly to provide protection and prevent the high-temperature weld material after welding from directly contacting the air, causing rapid oxidation and reducing welding efficiency. Then, the slow-speed motor 10 and the drive motor will be restarted and reversed to return the device to its original position for the next welding operation.

[0039] The switch control assembly includes a piston plate 15 that is slidably installed inside a three-way pipe 12. A fixed plate 17 is fixedly connected to the end of the three-way pipe 12 via multiple third connecting rods 16. A threaded rod 18 is fixedly connected to the outside of the fixed plate 17. A threaded cylinder 19 is threadedly sleeved on the threaded rod 18. The threaded cylinder 19 is slidably connected to the control cover 9. A rotating ring 20 is rotatably sleeved on the threaded cylinder 19. The rotating ring 20 is fixedly connected to the piston plate 15 via multiple fourth connecting rods 21.

[0040] First, the thread pitch of the outer thread of the threaded rod 18 is relatively large, meaning that when the threaded rod 18 rotates a small angle, it can drive the threaded cylinder 19 to move a large distance. Second, after the slow motor 10 is started, the slow motor 10 drives the three-way pipe 12 to rotate through the first gear 11 and the second gear 13. The three-way pipe 12 drives the third connecting rod 16 and the fixing plate 17 to rotate. The fixing plate 17 drives the threaded rod 18 to rotate. Since the threaded cylinder 19 and the threaded rod 18 are threadedly connected, and the threaded cylinder 19 and the control cover 9 are slidably connected, the rotating threaded rod 18 will drive the threaded cylinder 19 to move relative to the control cover 9. The threaded cylinder 19 will drive the rotating ring 20 to move. Since the rotating ring 20 is fixedly connected to the piston plate 15 through the fourth connecting rod 21, the rotating ring 20, which moves with the threaded cylinder 19, will drive the piston plate 15 to move through the fourth connecting rod 21.

[0041] Initially, when the slow-speed motor 10 is started, the piston plate 15 is still inside the three-way pipe 12. However, after the welding torch head is started, the piston plate 15 moves out of the three-way pipe 12. At this time, the other output end of the three-way pipe 12 is opened, that is, the left output end is opened. The argon gas entering the three-way pipe 12 will not only flow out along the direction of the telescopic pipe 14, but also flow out from the left output end of the three-way pipe 12. The argon gas flowing out from the left output end enters between the fixed cover 6 and the control cover 9. And during the process of the piston plate 15 moving out of the three-way pipe 12, as... Figure 7As shown, the piston plate 15 is conical at the end near the three-way pipe 12. As the piston plate 15 moves, the greater the distance between the piston plate 15 and the three-way pipe 12, the larger the opening on the left side of the three-way pipe 12, and the greater the flow rate of argon gas. When the piston plate 15 is completely removed from the three-way pipe 12, the flow rate of argon gas reaches its maximum, thereby enabling better control of argon gas, further reducing waste, and improving argon gas utilization.

[0042] A limiting rod 28 is fixedly connected to the outside of the rotating ring 20. The limiting rod 28 is rotatably connected to a second connecting rod 22. A fixed ring 23 is fixedly sleeved on the telescopic tube 14. The second connecting rod 22 and the telescopic tube 14 are rotatably connected.

[0043] During the movement of the rotating ring 20 relative to the tee pipe 12, the second connecting rod 22 causes the telescopic pipe 14 and the fixed ring 23 to move telescopically relative to the tee pipe 12. When the rotating ring 20 moves away from the tee pipe 12, the second connecting rod 22 causes the fixed ring 23 to move away from the tee pipe 12. During the welding process, the telescopic pipe 14 gradually moves closer to the stainless steel pipe. After the welding torch is closed, the distance between the telescopic pipe 14 and the stainless steel pipe is small, and the argon gas discharged from the telescopic pipe 14 directly faces the weld, resulting in a large impact force on the weld. According to the formula for convective heat transfer cooling capacity, with a constant gas temperature, the greater the gas impact force, the higher the convective heat transfer coefficient, and the more heat is removed per unit time, thus allowing the weld temperature to drop more quickly.

[0044] The end of the telescopic tube 14 is fixedly connected to a rotating head 24 via a third flexible hose. The telescopic tube 14 is fixedly connected to a clamping plate 25. The clamping plate 25 is rotatably connected to the rotating head 24 via a clamping rod 26. A torsion spring 27 is fixedly connected between the clamping plate 25 and the rotating head 24. The second connecting rod 22 is fixedly connected to a third gear 29. The fixing ring 23 is slidably connected to a third rack 37. The third gear 29 and the third rack 37 are meshed. A lifting plate 38 is fixedly connected to the third rack 37. Multiple protrusions 39 are fixedly connected to the lifting plate 38. A stop block 30 is fixedly connected to the outside of the rotating head 24. The stop block 30 and the protrusions 39 are positioned opposite each other.

[0045] At the start of welding, there is a large gap between the lifting plate 38 and the abutment 30. During the welding process, as the second connecting rod 22 moves, the third gear 29 rotates. The third gear 29 drives the third rack 37 to move upward, and the third rack 37 drives the lifting plate 38 to move upward. After the welding gun head is closed, the protrusion 39 and the abutment 30 abut against each other. Under the obstruction of the protrusion 39, an obstruction is formed on the abutment 30, which causes the rotating head 24 to rotate relative to the telescopic tube 14, thereby allowing the argon gas to impact more different positions, thus better forming the heat dissipation function of the weld.

[0046] An inclined ring 31 is fixedly connected to the outside of the rotating ring 20. The inclined ring 31 is positioned opposite to the fixed cover 6 and the control cover 9.

[0047] When the welding operation begins, the inclined ring 31 will control the opening and closing of the gap between the fixed cover 6 and the control cover 9. At this time, due to the obstruction of the inclined ring 31, only a small amount of argon gas will be discharged from the gap between the fixed cover 6, the control cover 9, and the inclined ring 31. Since the rotating ring 20 moves in a spiral motion, the rotating ring 20 drives the inclined ring 31 to rotate and move at the same time, similar to spiral movement, gradually opening the gap between the fixed cover 6 and the control cover 9 completely, thus completing the opening and closing control of the initial argon gas movement trajectory.

[0048] The fixed cover 6 is fixedly connected with multiple mounting bolts 32, and the control cover 9 has multiple mounting holes 33. The position and number of the mounting bolts 32 are opposite to the mounting holes 33, and the mounting bolts 32 pass through the mounting holes 33. Each mounting bolt 32 is threaded with two mounting nuts 34. The two mounting nuts 34 are located on both sides of the control cover 9 and abut against the control cover 9.

[0049] Before starting the welding operation, adjust the position of the control cover 9 relative to the fixed cover 6 according to the actual size of the weld. Rotate the mounting nut 34 so that the mounting nut 34 and the control cover 9 abut against each other, thereby completing the position adjustment and fixing operation of the control cover 9.

[0050] The control cover 9 has a sliding groove 35, and a sliding rod 36 is slidably connected in the sliding groove 35. The sliding rod 36 is fixedly connected to the threaded cylinder 19.

[0051] Determine and limit the movement trajectory of the rotating ring 20 relative to the control cover 9.

[0052] In this invention, during the welding process, the pump body 2 is started, and the pump body 2 allows argon gas to enter the fixed cover 6 along the direction of the first hose 3-straight pipe 4. For the argon gas that just enters the fixed cover 6, there are two different transport routes. First, the argon gas flows through the gap between the fixed cover 6 and the isolation cover 7, and then flows out completely from the fixed cover 6 through the gap between the fixed cover 6 and the control cover 9. When the argon gas is completely discharged from the fixed cover 6 and moves to the outside of the weld 2, the argon gas will squeeze out the air near the weld.

[0053] Secondly, the argon gas entering the fixed cover 6 will enter the three-way pipe 12 and flow along the direction of the three-way pipe 12. The argon gas entering the three-way pipe 12 will enter the telescopic pipe 14 and flow along the direction of the telescopic pipe 14. The argon gas ejected from the telescopic pipe 14 will also be discharged from between the fixed cover 6 and the control cover 9, but it will increase the argon gas concentration at the relative position of the opening of the telescopic pipe 14. During the welding process, the slow motor 10 and the drive motor are started at the same time, and the speed of the slow motor 10 and the drive motor is exactly the same. The slow motor 10 drives the three-way pipe 12 to rotate through the first gear 11 and the second gear 13. The three-way pipe 12 drives the telescopic pipe 14 to rotate. The welding gun head and the telescopic pipe 14 rotate synchronously, which can increase the argon gas concentration at the welding position.

[0054] After the slow motor 10 is started, the slow motor 10 drives the three-way pipe 12 to rotate through the first gear 11 and the second gear 13. The three-way pipe 12 drives the third connecting rod 16 and the fixing plate 17 to rotate. The fixing plate 17 drives the threaded rod 18 to rotate. The rotating threaded rod 18 will drive the threaded cylinder 19 to move relative to the control cover 9. The threaded cylinder 19 drives the rotating ring 20 to move. The rotating ring 20 drives the piston plate 15 to move through the fourth connecting rod 21.

[0055] In the initial stage of starting the slow motor 10, the piston plate 15 is still inside the three-way pipe 12. However, after the welding gun head is started, the piston plate 15 moves out of the three-way pipe 12. At this time, the other output end of the three-way pipe 12 is opened, that is, the output end on the left is opened. At this time, the argon gas entering the three-way pipe 12 will not only flow out along the direction of the telescopic pipe 14, but also flow out from the left output end of the three-way pipe 12. At this time, the argon gas flowing out from the left output end enters between the fixed cover 6 and the control cover 9. As the piston plate 15 begins to move out of the three-way pipe 12, the greater the distance between the piston plate 15 and the three-way pipe 12, the larger the opening on the left side of the three-way pipe 12, and the greater the flow rate of the argon gas. When the piston plate 15 is completely moved out of the three-way pipe 12, the flow rate of the argon gas reaches its maximum.

[0056] During the movement of the rotating ring 20 relative to the tee pipe 12, under the action of the second connecting rod 22, the telescopic pipe 14 and the fixed ring 23 will move telescopically relative to the tee pipe 12. During the welding process, the telescopic pipe 14 gradually moves closer to the stainless steel pipe. After the welding gun head is closed, the distance between the telescopic pipe 14 and the stainless steel pipe is small. The argon gas discharged from the telescopic pipe 14 is directly opposite to the weld, and the impact force on the weld is large.

[0057] At the start of welding, there is a large gap between the lifting plate 38 and the abutment 30. During the welding process, as the second connecting rod 22 moves, the third gear 29 rotates. The third gear 29 drives the third rack 37 to move upward, and the third rack 37 drives the lifting plate 38 to move upward. After the welding gun head is closed, the protrusion 39 and the abutment 30 abut against each other. Under the obstruction of the protrusion 39, an obstruction is formed on the abutment 30, which causes the rotating head 24 to rotate relative to the telescopic tube 14, thereby allowing the argon gas to impact more different positions.

Claims

1. A fully automatic precision argon arc welding device for stainless steel pipe processing, comprising a base (1), characterized in that, The base (1) is fixedly equipped with welding components and internal protective components. The internal protection assembly includes a pump body (2) fixedly mounted on a base (1), a first hose (3) fixedly mounted on the output end of the pump body (2), a straight pipe (4) fixedly connected to the first hose (3), a hydraulic cylinder (5) fixedly mounted on the base (1), the straight pipe (4) and the output end of the hydraulic cylinder (5) fixedly connected, a fixed cover (6) fixedly connected to the straight pipe (4), an isolation cover (7) fixedly connected inside the fixed cover (6) by a plurality of first connecting rods (8), a control cover (9) slidably mounted on the fixed cover (6), and the isolation cover (9) slidably mounted on the control cover (6). The cover (7) is fixedly installed with a slow-speed motor (10), the output shaft of the slow-speed motor (10) is fixedly connected to a first gear (11), the cover (7) is rotatably connected to a three-way pipe (12), the three-way pipe (12) is fixedly sleeved with a second gear (13), the first gear (11) and the second gear (13) mesh with each other, one output end of the three-way pipe (12) is fixedly connected to a telescopic pipe (14), the internal protection component also includes a switch control component, the switch control component can complete the switch control of the other output end of the three-way pipe (12).

2. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 1, characterized in that, The switch control assembly includes a piston plate (15) slidably installed inside a three-way pipe (12). The end of the three-way pipe (12) is fixedly connected to a fixing plate (17) via multiple third connecting rods (16). The fixing plate (17) is fixedly connected to a threaded rod (18). The threaded rod (18) is threadedly sleeved with a threaded cylinder (19). The threaded cylinder (19) and the control cover (9) are slidably connected. The threaded cylinder (19) is rotatably sleeved with a rotating ring (20). The rotating ring (20) is fixedly connected to the piston plate (15) via multiple fourth connecting rods (21).

3. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 2, characterized in that, The rotating ring (20) is fixedly connected to a limiting rod (28), the limiting rod (28) is rotatably connected to a second connecting rod (22), the telescopic tube (14) is fixedly sleeved with a fixing ring (23), and the second connecting rod (22) and the telescopic tube (14) are rotatably connected.

4. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 3, characterized in that, The telescopic tube (14) is fixedly connected to a rotating head (24) via a third flexible tube. The telescopic tube (14) is fixedly connected to a clamping plate (25). The clamping plate (25) is rotatably connected to the rotating head (24) via a clamping rod (26). A torsion spring (27) is fixedly connected between the clamping plate (25) and the rotating head (24). The second connecting rod (22) is fixedly connected to a third gear (29). The fixing ring (23) is slidably connected to a third rack (37). The third gear (29) and the third rack (37) are meshed. A lifting plate (38) is fixedly connected to the third rack (37). The lifting plate (38) is fixedly connected to multiple protrusions (39). A stop block (30) is fixedly connected to the outside of the rotating head (24). The stop block (30) and the protrusions (39) are positioned opposite each other.

5. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 2, characterized in that, The limiting rod (28) is fixedly connected to an inclined ring (31), which is positioned opposite to the fixed cover (6) and the control cover (9).

6. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 1, characterized in that, The fixed cover (6) is fixedly connected with a number of mounting bolts (32), and the control cover (9) has a number of mounting holes (33). The position and number of the mounting bolts (32) are opposite to the mounting holes (33), and the mounting bolts (32) pass through the mounting holes (33). Each mounting bolt (32) is threaded with two mounting nuts (34). The two mounting nuts (34) are located on both sides of the control cover (9) and abut against the control cover (9).

7. The precision argon arc welding equipment for fully automatic stainless steel pipe processing according to claim 2, characterized in that, The control cover (9) has a sliding groove (35) inside, and a sliding rod (36) is slidably connected in the sliding groove (35). The sliding rod (36) and the threaded cylinder (19) are fixedly connected.

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