A closed tube-to-tube welding gun

Abstract

The present application discloses a closed pipe-to-pipe welding gun, which relates to the technical field of pipe welding, and includes a body and a head. The head is arranged on the body, a processing hole is formed in the head, a small-diameter pipe passes through the processing hole, a side wall of the head abuts against the outer side wall of the large-diameter pipe, a clamping mechanism is arranged on the side of the head away from the large-diameter pipe, the clamping mechanism clamps the small-diameter pipe, a welding mechanism is arranged in the head, and the welding point of the welding mechanism is located on the side of the processing hole close to the large-diameter pipe. The present application utilizes the clamping mechanism, when one side of the head moves to abut against the large-diameter pipe, the clamping mechanism is located on the side of the head away from the large-diameter pipe, the clamping mechanism is first used to clamp and fix the small-diameter pipe, and then the welding mechanism is used to weld the connection between the two pipes, and the welding point of the welding mechanism is located on the side of the processing hole close to the large-diameter pipe, so as to facilitate stable welding of two pipes with large diameter differences.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline welding, and in particular to a closed pipe-to-pipe welding gun. Background Art

[0002] The closed pipe welding gun is a special equipment for welding pipes. It adopts a closed design to ensure better gas protection effect during welding and is suitable for high-precision welding needs. It has a compact structure and flexible operation. It is often used for pipe welding of materials such as stainless steel and titanium alloys. It is especially suitable for narrow or complex space operations and is widely used in the fields of petroleum, chemical industry, nuclear power, etc.

[0003] At present, pipe-to-pipe welding guns are mostly used to weld two pipes of the same or similar diameters, butt the ends of the two pipes close to each other, and then use pipe-to-pipe welding guns to weld the butt joints of the two pipes. Figure 1 When the diameters of the two pipes to be welded differ greatly, the small-diameter pipe 32 is inserted into the side wall of the large-diameter pipe 31 for welding. Since the welding position is close to the outer wall of the large-diameter pipe 31, on the one hand, it is difficult to clamp and fix the pipe, and on the other hand, it is difficult for the welding needle of the welding gun to align with the required welding position of the two pipes, and thus it is difficult to stably weld the two pipes with a large diameter difference. Summary of the invention

[0004] In order to facilitate stable welding of two pipes with a large difference in caliber, the present application provides a closed pipe-to-pipe welding gun.

[0005] The closed tube-to-tube welding gun provided in this application adopts the following technical solution:

[0006] A closed pipe-to-pipe welding gun comprises a body and a head, wherein the head is arranged on the body, a processing hole is formed in the head, a small-diameter pipe passes through the processing hole, a side wall of the head abuts against an outer side wall of a large-diameter pipe, a clamping mechanism is arranged on a side of the head away from the large-diameter pipe, the clamping mechanism clamps the small-diameter pipe, a welding mechanism is arranged in the head, and a welding point of the welding mechanism is located on a side of the processing hole close to the large-diameter pipe.

[0007] By adopting the above technical solution, when welding two pipes with a large difference in diameter, the machine head is driven to move by the machine body so that the small-diameter pipe passes through the processing hole. When one side of the machine head moves to abut the large-diameter pipe, the small-diameter pipe is clamped and fixed by a clamping mechanism, and then the connection between the two pipes is welded by a welding mechanism. The welding point of the welding mechanism is located on the side of the processing hole close to the large-diameter pipe, thereby facilitating stable welding of the two pipes with a large difference in diameter.

[0008] Preferably, the clamping mechanism includes a mounting seat, a first clamping plate, two second clamping plates, a rotating block and a clamping rod, the mounting seat is fixedly arranged on the side wall of the machine head, the first clamping plate is arranged on the inner side of the mounting seat, the two second clamping plates are rotatably arranged on the outer side of the mounting seat, the two rotating blocks are rotatably arranged on the mounting seat and are located on both sides of the first clamping plate, the two clamping rods are arranged on both sides of the mounting seat, the ends of the clamping rods are rotatably connected to the second clamping plate, the clamping rods are rotatably connected to the rotating block, and a locking block is arranged on the side wall of the second clamping plate. When the two clamping rods rotate toward each other, the two clamping rods drive the two second clamping plates to rotate toward the first clamping plate, the first clamping plate and the two second clamping plates clamp the small-diameter pipe, and the ends of the clamping rods press against the locking block and lock the second clamping plate.

[0009] By adopting the above technical solution, after the small-diameter pipe passes through the processed hole of the machine head, it is located between the first clamping plate and the two second clamping plates. When the machine head moves to abut the large-diameter pipe, the two clamping rods are simultaneously rotated in the direction of approaching each other. Under the action of the rotating block, the two clamping rods drive the two second clamping plates to rotate in the direction of approaching the two first clamping plates. After the two second clamping plates move to abut the small-diameter pipe, the end of the clamping rod abuts the locking block. Under the action of friction force, the clamping rod locks the second clamping plate, so that the first clamping plate and the two second clamping plates clamp and fix the small-diameter pipe.

[0010] Preferably, the welding mechanism includes a driving member, a transmission member, a gear ring, a limiting ring and a tungsten needle, the limiting ring is arranged in the machine head, the gear ring is rotatably arranged in the limiting ring, the tungsten needle is arranged on the side wall of the gear ring away from the clamping mechanism, the driving member is arranged in the fuselage, the transmission member is arranged in the machine head, and the transmission member transmission-connects the driving member and the gear ring.

[0011] By adopting the above technical solution, the driving member drives the gear ring to rotate in the limiting ring through the transmission component, and the gear ring drives the tungsten needle to rotate around the connection between the two pipes. Since the tungsten needle is located on the side of the gear ring close to the large-diameter pipe, the tungsten needle can be aligned with the connection between the two pipes, thereby facilitating the welding of the two pipes.

[0012] Preferably, the transmission component includes a mounting plate, a coupling, a first bevel gear, a second bevel gear, a driving gear, two synchronous gears and a driven gear, the coupling is arranged at the driving end of the driving member, the first bevel gear is arranged on the coupling, the mounting plate is fixedly arranged in the machine head, the driving gear is rotatably arranged on the mounting plate, the second bevel gear is coaxially arranged on the side wall of the driving gear and meshes with the first bevel gear, the two synchronous gears are rotatably arranged on the mounting plate and meshed with the driving gear, the two driven gears are rotatably arranged on the mounting plate and respectively meshed with the two synchronous gears, and the two driven gears are meshed with the ring gear.

[0013] By adopting the above technical solution, the driving member drives the first bevel gear to rotate through the coupling, the first bevel gear drives the driving gear to rotate through the second bevel gear, the driving gear drives the two synchronous gears to rotate synchronously, the two synchronous gears drive the two driven gears to rotate synchronously, and the two driven gears then drive the ring gear to rotate, thereby driving the tungsten needle to rotate around the connection between the two pipes.

[0014] Preferably, a protrusion is fixedly mounted on the side wall of the gear ring, a mounting block is rotatably mounted inside the protrusion, and the tungsten needle is arranged inside the mounting block.

[0015] By adopting the above technical solution, the tungsten needle is installed on the side wall of the gear ring through the mounting block and the protrusion. The tungsten needle can be driven to deflect by rotating the mounting block, thereby facilitating the welding of the tungsten needle.

[0016] Preferably, a cooling channel is opened in the limiting ring, and a water inlet pipe and a water outlet pipe are arranged in the fuselage, one end of the water inlet pipe and the water outlet pipe pass through the machine head and are respectively connected to the two ends of the cooling channel, and the other end of the water inlet pipe and the water outlet pipe are connected to the cooling equipment.

[0017] By adopting the above technical solution, the cooling equipment injects the cooling medium into the water inlet pipe, the cooling medium enters the cooling channel from the water inlet pipe, and then flows back to the cooling equipment from the water outlet pipe. In the process of the cooling medium flowing through the cooling channel, the welding mechanism will be cooled through the limit ring, thereby cooling the machine head.

[0018] Preferably, an air supply ring is provided in the machine head on the side of the limiting ring away from the gear ring, an air supply channel is opened in the air supply ring, an air supply pipe is provided in the fuselage, one end of the air supply pipe passes through the machine head and is connected with the air supply channel, the other end of the air supply pipe is connected to the air supply equipment, and a plurality of air supply holes are spaced apart on the side wall of the air supply ring close to the gear ring.

[0019] By adopting the above technical solution, the gas supply equipment injects argon into the gas supply channel through the gas supply pipe, and the argon gas then enters the processing hole through the gas supply hole. The argon gas serves as a protective gas to isolate the air and prevent metal oxidation in the welding area, thereby improving the overall quality of welding.

[0020] Preferably, a first baffle is provided on the side wall of the machine head close to the large-diameter pipe, and a second baffle is provided on the side wall of the machine head away from the first baffle. The small-diameter pipe passes through the first baffle and the second baffle, and the first baffle and the second baffle cover the opening of the processing hole.

[0021] By adopting the above technical solution, when argon gas is injected into the processing hole, the first baffle plate and the second baffle plate shield the opening of the processing hole, so that the argon gas can fill the processing hole, thereby further improving the protection effect of the argon gas.

[0022] Preferably, a plurality of moving rods are slidably provided on the side wall of the machine head away from the clamping mechanism, the end of the moving rod extends outside the machine head, and a positioning wheel is provided at the end of the moving rod located outside the machine head, and the positioning wheel abuts against the outer wall of the large-diameter pipe, and a non-return rack is fixedly provided at one end of the moving rod away from the positioning wheel, and a plurality of first elastic members are provided in the machine head, and a retaining ring is fixedly provided on the moving rod, and one end of the first elastic member close to the positioning wheel abuts against the retaining ring, and a push rod is slidably provided on the side wall of the machine head close to the clamping mechanism, and a driving rack is slidably provided in the machine head, and the push rod is fixedly connected with the driving rack, and a first gear is rotatably provided in the machine head, and the first gear is meshed with the driving rack, and a locking mechanism connected to the first gear transmission is provided in the machine head. When the clamping mechanism clamps and fixes the small-diameter pipe, the end of the clamping rod pushes the push rod to move, and the push rod drives the locking mechanism to lock the plurality of non-return racks through the first gear.

[0023] By adopting the above technical solution, when the machine head moves to abut the outer wall of the large-diameter pipe, the elastic member pushes the moving rod to move through the retaining ring, and the moving rod drives the positioning wheel to abut the outer wall of the large-diameter pipe. When the clamping mechanism clamps and fixes the small-diameter pipe, the end of the clamping rod pushes the push rod to move, and the push rod drives the driving rack to move, and the driving rack drives the first gear to rotate. The first gear locks multiple non-return racks through the driving mechanism, and then locks the positioning wheel through the moving rod, so that the multiple locking wheels are pressed against the outer wall of the large-diameter pipe, so that the machine head can be positioned, and the welding gun is more stable during the welding process.

[0024] Preferably, the locking mechanism includes a synchronous belt, a plurality of second gears, a screw rod, a slider, a push block and a locking rack. The plurality of second gears are rotatably arranged in the machine head and correspond one-to-one with the plurality of non-return racks. The synchronous belt is rotatably sleeved on the first gear and the plurality of second gears. The plurality of screw rods are coaxially fixed on the side walls of the plurality of second gears. The plurality of sliders are slidably arranged in the machine head. The plurality of screw rods are threadedly arranged in the plurality of sliders. The plurality of locking racks are arranged in the machine head and are located below the plurality of non-return racks. The plurality of push blocks are fixedly arranged on the plurality of locking racks. The slider and the push block are located in the same plane. Chamfers are formed on the side walls of the slider and the push block that are close to each other. When the locking rack moves upward, the locking rack clamps the non-return rack and locks the positioning wheel.

[0025] By adopting the above technical solution, the first gear drives multiple second gears to rotate through the synchronous belt, the second gear drives the screw to rotate, the screw drives the slider to slide, the slider pushes the push block to move upward through the chamfer, the push block drives the locking rack to move upward, the locking rack moves to clamp the anti-return rack, so that the positioning wheel can be locked.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Using the clamping mechanism, when one side of the machine head moves to abut against the large-diameter pipe, the clamping mechanism is located on the side of the machine head away from the large-diameter pipe. The small-diameter pipe is first clamped and fixed by the clamping mechanism, and then the connection between the two pipes is welded by the welding mechanism. The welding point of the welding mechanism is located on the side of the processing hole close to the large-diameter pipe, so as to facilitate stable welding of two pipes with large diameter differences;

[0028] 2. With the help of the cooling channel, the cooling equipment injects the cooling medium into the water inlet pipe, the cooling medium enters the cooling channel from the water inlet pipe, and then flows back to the cooling equipment from the water outlet pipe. When the cooling medium flows through the cooling channel, the limit ring will cool down the welding mechanism, thereby cooling down the machine head;

[0029] 3. Through the gas supply channel, the gas supply equipment injects argon gas into the gas supply channel through the gas supply pipe, and the argon gas then enters the processing hole through the gas supply hole. Argon gas, as a protective gas, isolates the air and prevents metal oxidation in the welding area, thereby improving the overall quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a large-diameter pipeline and a small-diameter pipeline in the background technology of this application;

[0031] Figure 2 This is a schematic diagram of the overall structure of the closed tube-to-tube welding gun in Example 1 of the present application;

[0032] Figure 3 This is an exploded view of a portion of the structure of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the first baffle and the second baffle;

[0033] Figure 4 This is an exploded view of a portion of the structure of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the clamping mechanism;

[0034] Figure 5 This is a partial structural diagram of the closed tube-to-tube welding gun in Example 1 of the present application, which is to highlight the open state of the clamping mechanism;

[0035] Figure 6 This is a partial structural cross-sectional view of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the clamping state of the clamping mechanism;

[0036] Figure 7 This is a partial structural diagram of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the welding mechanism;

[0037] Figure 8This is a partial structural schematic diagram of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the first bevel gear and the second bevel gear;

[0038] Fig. 9 This is a partial structural cross-sectional view of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the gas supply channel;

[0039] Fig.10 This is a partial structural cross-sectional view of the closed tube-to-tube welding gun in Example 1 of the present application, in order to highlight the cooling channel;

[0040] Fig.11 It is a partial structural schematic diagram of the closed tube-to-tube welding gun in Example 2 of the present application;

[0041] Fig.12 This is a partial structural diagram of the closed tube-to-tube welding gun in Example 2 of the present application, in order to highlight the locking mechanism;

[0042] Fig.13 It is a partial structural schematic diagram of the closed tube-to-tube welding gun in Example 2 of the present application, in order to highlight the push rod;

[0043] Fig.14 This is a partial structural cross-sectional view of the closed tube-to-tube welding gun in Example 2 of the present application.

[0044] Figure numerals: 1, head; 2, fuselage; 3, processing hole; 4, clamping mechanism; 41, mounting seat; 42, first clamping plate; 43, second clamping plate; 44, rotating block; 45, clamping rod; 46, locking block; 5, welding mechanism; 51, driving member; 52, transmission member; 521, mounting plate; 522, coupling; 523, first bevel gear; 524, second bevel gear; 525, driving gear; 526, synchronous gear; 527, driven gear; 53, gear ring; 54, limiting ring; 55, tungsten needle; 7, cooling channel; 8, water inlet pipe; 9, water outlet pipe; 10, air supply ring; 11, air supply channel; 12, air supply hole; 13, first baffle; 1 4. Second baffle; 15. Connecting block; 16. Boss; 17. Mounting block; 18. Moving rod; 19. Positioning wheel; 20. Check rack; 21. First elastic member; 22. Retaining ring; 23. Push rod; 24. Driving rack; 25. First gear; 26. Locking mechanism; 261. Synchronous belt; 262. Second gear; 263. Screw rod; 264. Sliding block; 265. Push block; 266. Locking rack; 27. Chamfer; 28. Second elastic member; 29. ​​Accommodating hole; 30. Air supply pipe; 31. Large-diameter pipe; 32. Small-diameter pipe; 33. First rotating shaft; 34. Second rotating shaft; 35. Guide rod; 36. Moving block; 37. Tension spring. DETAILED DESCRIPTION

[0045] The following is combined with Figure 2-Figure 14This application is described in further detail.

[0046] Embodiment 1:

[0047] The embodiment of the present application discloses a closed tube-to-tube welding gun.

[0048] Reference Figure 2 and Figure 3 A closed pipe-to-pipe welding gun includes a body 2 and a head 1. A connection block 15 is fixedly installed at one end of the body 2 in the length direction, and the head 1 is fixedly installed on the side of the connection block 15 away from the body 2. A processing hole 3 is formed at the end of the head 1 away from the body 2, and the side of the head 1 located away from the processing hole 3 is open. A clamping mechanism 4 is installed on one side wall of the head 1, and the clamping mechanism 4 is used to clamp a small-diameter pipe. A welding mechanism 5 is installed in the head 1, and the welding point of the welding mechanism 5 is located on the side away from the clamping mechanism 4.

[0049] When welding the small-diameter pipe 32 and the large-diameter pipe 31, first insert the small-diameter pipe 32 into the side wall of the large-diameter pipe 31, and then spot weld the connection between the small-diameter pipe 32 and the large-diameter pipe 31. Then, the machine head 1 is driven to move by the machine body 2, so that the small-diameter pipe 32 passes through the processing hole 3. When one side of the machine head 1 moves to abut against the large-diameter pipe 31, the clamping mechanism 4 is located on the side of the machine head 1 away from the large-diameter pipe 31, and the clamping mechanism 4 is first used to clamp and fix the small-diameter pipe 32. Then, the welding mechanism 5 is used to weld the connection between the two pipes, and the welding point of the welding mechanism 5 is located on the side of the processing hole 3 close to the large-diameter pipe 31, so as to facilitate stable welding of two pipes with large diameter differences.

[0050] Reference Figure 4 , Figure 5 and Figure 6 Specifically, the clamping mechanism 4 includes a mounting seat 41, a first clamping plate 42, two second clamping plates 43, a locking block 46, a rotating block 44 and a clamping rod 45. The mounting seat 41 is fixedly mounted on the side wall of the machine head 1 and is located on the side of the machine head 1 away from the large-diameter pipe 31. The first clamping plate 42 is arc-shaped and fixedly mounted in the middle of the inner side of the mounting seat 41. The second clamping plate 43 is arc-shaped, and the two locking blocks 46 are fixedly mounted on the outer side walls of the two second clamping plates 43. The locking blocks 46 are rotatably mounted in the mounting seat 41 through the second rotating shaft 34. The two second clamping plates 43 are rotatably mounted on the mounting seat 41 through the locking blocks 46, and the two second clamping plates 43 are respectively located on the upper and lower sides of the first clamping plate 42.

[0051] The two rotating blocks 44 are rotatably mounted on the upper and lower sides of the mounting seat 41 through the first rotating shaft 33, and the two clamping rods 45 are respectively mounted on the upper and lower sides of the mounting seat 41. One clamping rod 45 is rotatably connected to one rotating block 44 and one locking block 46, and the end of the clamping rod 45 is located at the locking block 46.

[0052] After passing through the processing hole 3, the small-diameter pipe 32 enters between the first clamping plate 42 and the second clamping plate 43, and grips the two clamping rods 45 in the direction of approaching each other. Under the action of the rotating block 44, the clamping rod 45 drives the locking block 46 to rotate, and the locking block 46 drives the second clamping plate 43 to rotate. The two second clamping plates 43 rotate in the direction of approaching the first clamping plate 42 and cooperate with the first clamping plate 42 to clamp the small-diameter pipe 32. After the two second clamping plates 43 move to clamp the small-diameter pipe 32, the side wall of the end of the clamping rod 45 is pressed against the side wall of the locking block 46 at point D. Under the action of the friction force at point D, the clamping rod 45 locks the locking block 46, and the locking block 46 then locks the second clamping plate 43, so that the first clamping plate 42 and the two second clamping plates 43 clamp and fix the small-diameter pipe 32.

[0053] Reference Figure 7 , Figure 8 and Fig. 9 Specifically, the welding mechanism 5 includes a driving member 51, a transmission member 52, a gear ring 53, a limit ring 54 and a tungsten needle 55. The driving member 51 is fixedly installed in the fuselage 2. In the present application, the driving member 51 can be selected as a servo motor. The transmission member 52 includes a mounting plate 521, a coupling 522, a first bevel gear 523, a second bevel gear 524, a driving gear 525, two synchronous gears 526 and a driven gear 527. The coupling 522 is installed at the driving end of the driving member 51, and the coupling 522 passes through the connecting block 15. The first bevel gear 523 is fixedly installed on the side of the coupling 522 away from the driving member 51, and the first bevel gear 523 is located in the head 1.

[0054] The mounting plate 521 is fixedly mounted in the body 2, the driving gear 525 is rotatably mounted on the mounting plate 521, the second bevel gear 524 is embedded and fixedly mounted in the side wall of the driving gear 525, the second bevel gear 524 is coaxially mounted with the driving gear 525, and the second bevel gear 524 is meshed with the first bevel gear 523. Two synchronous gears 526 are rotatably mounted on the mounting plate 521, and the two synchronous gears 526 are meshed with the driving gear 525. Two driven gears 527 are rotatably mounted on the mounting plate 521, and the two driven gears 527 are respectively meshed with the two synchronous gears 526.

[0055] The limiting ring 54 is installed in the machine head 1, and the gear ring 53 is coaxially rotatably installed on the side wall of the limiting ring 54 away from the clamping mechanism 4. The limiting ring 54 and the gear ring 53 are both C-shaped, and two driven gears 527 are meshed with the gear ring 53. Two protrusions 16 are symmetrically protruded on the side wall of the gear ring 53 away from the limiting ring 54. A mounting block 17 is fixedly installed in the protrusion 16 by bolts. The mounting angle of the mounting block 17 can be rotatably adjusted, and the tungsten needle 55 is installed in the mounting block 17.

[0056] The driving member 51 drives the first bevel gear 523 to rotate through the coupling 522, the first bevel gear 523 drives the driving gear 525 to rotate through the second bevel gear 524, the driving gear 525 drives the driven gear 527 to rotate through the synchronous gear 526, the driven gear 527 drives the protrusion 16 to rotate through the gear ring 53, and the protrusion 16 drives the tungsten needle 55 to rotate through the mounting block 17. Since the tungsten needle 55 is located on the side of the gear ring 53 close to the large-diameter pipe 31, the tungsten needle 55 can be aligned with the connection of the two pipes, so as to facilitate welding of the two pipes.

[0057] Reference Figure 8 and Fig. 9 An air supply pipe 30 is installed in the fuselage 2, one end of which is connected to an external air supply device, and the other end of which passes through the connecting block 15 and extends into the fuselage head 1. An air supply ring 10 is installed in the fuselage 2 on the side of the limit ring 54 away from the gear ring 53, and the air supply ring 10 is C-shaped. An air supply channel 11 is provided inside the air supply ring 10, and the end of the air supply pipe 30 is connected to the air supply channel 11. A plurality of air supply holes 12 are spaced apart on the side wall of the air supply ring 10 near the gear ring 53, and the air supply holes 12 are connected to the air supply channel 11, and the air supply holes 12 face the small-diameter pipe 32.

[0058] The gas supply equipment injects argon into the gas supply channel 11 through the gas supply pipe 30, and the argon then enters the processing hole 3 through the gas supply hole 12. Argon serves as a protective gas to isolate the air and prevent metal oxidation in the welding area, thereby improving the overall quality of welding.

[0059] Reference Figure 3 The first baffle 13 and the second baffle 14 are fixedly installed on both sides of the machine head 1, respectively. The first baffle 13 is located on the side of the machine head 1 away from the clamping mechanism 4, and the second baffle 14 is located on the side of the machine head 1 close to the clamping mechanism 4. The small-diameter pipe 32 passes through the first baffle 13 and the second baffle 14. The first baffle 13 blocks and blocks the side of the processing hole 3 close to the large-diameter pipe 31. The second baffle 14 is L-shaped. The second baffle 14 blocks and blocks the side of the processing hole 3 away from the large-diameter pipe 31 and the open end of the processing hole 3 away from the fuselage 2, so that when argon gas is injected into the processing hole 3, it is convenient for argon gas to fill the processing hole 3, thereby further improving the protection effect of argon gas.

[0060] Reference Fig.10 A cooling channel 7 is provided in the limiting ring 54, a water inlet pipe 8 is installed in the fuselage 2, one end of the water inlet pipe 8 penetrates into the machine head 1 and is connected to one end of the cooling channel 7, a water outlet pipe 9 is installed in the fuselage 2, one end of the water outlet pipe 9 penetrates into the machine head 1 and is connected to the other end of the cooling channel 7, and the ends of the water inlet pipe 8 and the water outlet pipe 9 away from the machine head 1 are connected to an external cooling device.

[0061] The cooling device injects the cooling medium into the water inlet pipe 8, the cooling medium enters the cooling channel 7 from the water inlet pipe 8, and then flows back to the cooling device from the water outlet pipe 9. In the process of the cooling medium flowing through the cooling channel 7, the welding mechanism 5 will be cooled by the limit ring 54, so that the head 1 can be cooled.

[0062] At the same time, a power supply line is also extended into the water inlet pipe 8, and the power supply line supplies power to the limit ring 54, the limit ring 54 supplies power to the gear ring 53, and the gear ring 53 supplies power to the tungsten needle 55 through the mounting block 17. The gear ring 53 is always in friction contact with the limit ring 54 during the rotation process, so the tungsten needle 55 can be powered during the rotation process of the gear ring 53.

[0063] The implementation principle of a closed pipe-to-pipe welding gun in the embodiment of the present application is as follows: when welding a small-diameter pipe 32 and a large-diameter pipe 31, the machine head 1 is driven to move by the machine body 2 so that the small-diameter pipe 32 passes through the processing hole 3. When the first baffle 13 on one side of the machine head 1 moves to abut against the large-diameter pipe 31, the two clamping rods 45 are held in a direction close to each other, and the clamping rod 45 drives the locking block 46 to rotate under the action of the rotating block 44, and the locking block 46 drives the second clamping plate 43 to rotate, and the two second clamping plates 43 rotate in a direction close to the first clamping plate 42 and cooperate with the first clamping plate 42 to clamp the small-diameter pipe 32. After the two second clamping plates 43 move to clamp the small-diameter pipe 32, the end of the clamping rod 45 abuts against the side wall of the locking block 46, and under the action of friction, the clamping rod 45 locks the locking block 46, and the locking block 46 then locks the second clamping plate 43, so that the first clamping plate 42 and the two second clamping plates 43 clamp and fix the small-diameter pipe 32. The driving member 51 drives the first bevel gear 523 to rotate through the coupling 522, the first bevel gear 523 drives the driving gear 525 to rotate through the second bevel gear 524, the driving gear 525 drives the driven gear 527 to rotate through the synchronous gear 526, the driven gear 527 drives the protrusion 16 to rotate through the gear ring 53, and the protrusion 16 drives the tungsten needle 55 to rotate through the mounting block 17. Since the tungsten needle 55 is located on the side of the gear ring 53 close to the large-diameter pipe 31, the tungsten needle 55 can be aligned with the connection between the two pipes, so as to facilitate stable welding of two pipes with large diameter differences.

[0064] Embodiment 2:

[0065] Reference Fig.11 and Fig.12 The difference between this embodiment and the first embodiment is that four receiving holes 29 are provided on the first baffle plate 13, four moving rods 18 are slidably installed in the machine head 1, the ends of the four moving rods 18 pass through the four receiving holes 29 respectively, and a positioning wheel 19 is fixedly installed at the end of each moving rod 18 outside the machine head 1. A non-return rack 20 is fixedly installed at the end of each moving rod 18 away from the positioning wheel 19, and the non-return rack 20 slides in the machine head 1.

[0066] A retaining ring 22 is fixedly mounted on each moving rod 18, and the retaining ring 22 is slidably mounted in the receiving hole 29. Four first elastic members 21 are installed in the machine head 1, and the four first elastic members 21 are respectively sleeved on the four moving rods 18. The first elastic member 21 is located on the side of the retaining ring 22 away from the positioning wheel 19, and the two ends of the first elastic member 21 respectively abut the retaining ring 22 and the machine head 1. In the present application, the first elastic member 21 can be selected as a spring.

[0067] Reference Fig.12 , Fig.13 and Fig.14 A moving block 36 is slidably installed on the side wall of the machine head 1 close to the clamping mechanism 4 along the length direction of the machine head 1, a guide rod 35 is installed in the machine head 1, the guide rod 35 passes through the moving block 36, and a push rod 23 is fixedly installed on the side wall of the moving block 36. A second elastic member 28 is installed in the machine head 1, the second elastic member 28 abuts against the moving block 36 and is located on the side of the moving block 36 away from the fuselage 2. A driving rack 24 is slidably installed in the machine head 1 along its own length direction, the top wall of the driving rack 24 is fixedly connected to the bottom wall of the moving block 36, and a first gear 25 is rotatably installed in the machine head 1, and the first gear 25 is meshed with the driving rack 24. In the present application, the second elastic member 28 can be selected as a spring. A locking mechanism 26 is installed in the machine head 1, and the locking mechanism 26 is transmission-connected to the first gear 25.

[0068] When the first baffle 13 moves to abut the outer wall of the large-diameter pipe 31, the outer wall of the large-diameter pipe 31 abuts against the four positioning wheels 19 and pushes the four positioning wheels 19 to move, the positioning wheels 19 drive the moving rod 18 to move, and the moving rod 18 drives the retaining ring 22 to squeeze the first elastic member 21, so that the four positioning wheels 19 can always fit with the outer wall of the large-diameter pipe 31.

[0069] When the clamping rod 45 is rotated to clamp and fix the small-diameter pipe 32, the end of the clamping rod 45 pushes the push rod 23 to move, and the push rod 23 drives the driving rack 24 to move through the moving block 36, and the driving rack 24 drives the first gear 25 to rotate. The first gear 25 locks the four non-return racks 20 through the locking mechanism 26, and then locks the four positioning wheels 19. The four locking wheels are pressed against the outer wall of the large-diameter pipe 31, so that the head 1 can be positioned, making the welding gun more stable during the welding process.

[0070] Specifically, the locking mechanism 26 includes a synchronous belt 261, four second gears 262, a screw rod 263, a slider 264, a push block 265 and a locking rack 266. The four second gears 262 are rotatably mounted in the machine head 1 and correspond to the four check racks 20 one by one. The synchronous belt 261 is C-shaped and meshed and sleeved on the first gear 25 and the four second gears 262. The four screw rods 263 are coaxially fixedly mounted on the side walls of the four second gears 262, and the four sliders 264 are slidably mounted in the machine head 1 along the length direction of the screw rods 263. The ends of the four screw rods 263 away from the second gears 262 are respectively threadedly mounted in the four sliders 264.

[0071] Four locking racks 266 are slidably installed in the machine head 1 along the moving direction of the vertical slider 264, and four push blocks 265 are fixedly installed on the four locking racks 266. A tension spring 37 is installed in the machine head 1, and the tension spring 37 is connected to the push block 265 and pulls the locking rack 266 to separate from the check rack 20. The four push blocks 265 are located on the side of the four sliders 264 close to the positioning wheel 19, and the top of the side wall of the slider 264 close to the push block 265 and the bottom of the side wall of the push block 265 close to the slider 264 are both formed with chamfers 27.

[0072] When the first gear 25 rotates, the first gear 25 drives the synchronous belt 261 to rotate, and the synchronous belt 261 drives the four second gears 262 to rotate synchronously. The four synchronous gears 526 drive the four sliders 264 to move through the screw rod 263. The chamfer 27 of the slider 264 fits with the chamfer 27 of the push block 265 during the movement and pushes the push block 265 to move upward. The push block 265 drives the locking rack 266 to move upward. After the locking rack 266 moves upward, it clamps with the non-return rack 20, so that the non-return rack 20 can be locked, and then the positioning wheel 19 is locked.

[0073] The implementation principle of Example 2 of the present application is: when the first baffle 13 moves to abut against the outer side wall of the large-diameter pipe 31, the outer side wall of the large-diameter pipe 31 abuts against the four positioning wheels 19 and pushes the four positioning wheels 19 to move. When the clamping rod 45 is rotated to clamp and fix the small-diameter pipe 32, the end of the clamping rod 45 pushes the push rod 23 to move, and the push rod 23 drives the driving rack 24 to move through the moving block 36. The driving rack 24 drives the first gear 25 to rotate through the first gear 25, and the first gear 25 drives the four second gears 262 to rotate synchronously through the synchronous belt 261. The four synchronous gears 526 drive the four sliders 264 to move through the screw rod 263. The chamfer 27 of the slider 264 fits with the chamfer 27 of the push block 265 during the movement and pushes the push block 265 to move upward. The push block 265 drives the locking rack 266 to move upward. After the locking rack 266 moves upward, it clamps with the non-return rack 20, which can lock the non-return rack 20 and the positioning wheel 19. The four locking wheels are pressed against the outer wall of the large-diameter pipe 31, so that the head 1 can be positioned, making the welding gun more stable during the welding process.

[0074] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A closed tube-to-tube welding gun, comprising a body (2) and a head (1), wherein the head (1) is arranged on the body (2), characterized in that: A processing hole (3) is formed in the machine head (1), and the small-diameter pipe (32) passes through the processing hole (3). The side wall of the machine head (1) abuts against the outer wall of the large-diameter pipe (31). A clamping mechanism (4) is provided on the side of the machine head (1) away from the large-diameter pipe (31), and the clamping mechanism (4) clamps the small-diameter pipe (32). A welding mechanism (5) is provided in the machine head (1), and the welding point of the welding mechanism (5) is located on the side of the processing hole (3) close to the large-diameter pipe (31); the welding mechanism (5) ) comprises a driving member (51), a transmission member (52), a gear ring (53), a limiting ring (54) and a tungsten needle (55), wherein the limiting ring (54) is arranged in the machine head (1), the gear ring (53) is rotatably arranged in the limiting ring (54), the tungsten needle (55) is arranged on the side wall of the gear ring (53) away from the clamping mechanism (4), the driving member (51) is arranged in the machine body (2), the transmission member (52) is arranged in the machine head (1), and the transmission member (52) is transmission-connected to the driving member (51) and the gear ring (53); The clamping mechanism (4) comprises a mounting seat (41), a first clamping plate (42), two second clamping plates (43), a locking block (46), a rotating block (44) and a clamping rod (45); the mounting seat (41) is fixedly arranged on the side wall of the machine head (1); the first clamping plate (42) is arranged on the inner side of the mounting seat (41); the two second clamping plates (43) are rotatably arranged on the outer side of the mounting seat (41); the two rotating blocks (44) are rotatably arranged on the mounting seat (41) and are located on both sides of the first clamping plate (42); and the two clamping rods (45) are arranged on the mounting seat (41). On both sides, the ends of the clamping rod (45) are rotatably connected to the second clamping plate (43), the clamping rod (45) is rotatably connected to the rotating block (44), and the locking block (46) is arranged on the outer side wall of the second clamping plate (43). When the two clamping rods (45) rotate toward each other, the two clamping rods (45) drive the two second clamping plates (43) to rotate toward the first clamping plate (42), the first clamping plate (42) and the two second clamping plates (43) clamp the small-diameter pipe (32), and the ends of the clamping rod (45) are pressed against the locking block (46) and lock the second clamping plate (43).

2. A closed tube-to-tube welding gun according to claim 1, characterized in that: The transmission component (52) comprises a mounting plate (521), a coupling (522), a first bevel gear (523), a second bevel gear (524), a driving gear (525), two synchronous gears (526) and a driven gear (527); the coupling (522) is arranged at a driving end of the driving member (51); the first bevel gear (523) is arranged on the coupling (522); the mounting plate (521) is fixedly arranged in the machine head (1); the driving gear (525) is rotated The first bevel gear (524) is rotatably mounted on the mounting plate (521), the second bevel gear (524) is coaxially mounted on the side wall of the driving gear (525) and meshes with the first bevel gear (523), the two synchronous gears (526) are rotatably mounted on the mounting plate (521) and mesh with the driving gear (525), the two driven gears (527) are rotatably mounted on the mounting plate (521) and respectively mesh with the two synchronous gears (526), ​​and the two driven gears (527) mesh with the ring gear (53).

3. A closed tube-to-tube welding gun according to claim 1, characterized in that: A protrusion (16) is fixedly mounted on the side wall of the gear ring (53), a mounting block (17) is rotatably mounted inside the protrusion (16), and the tungsten needle (55) is arranged inside the mounting block (17).

4. A closed tube-to-tube welding gun according to claim 1, characterized in that: A cooling channel (7) is provided in the limiting ring (54), and a water inlet pipe (8) and a water outlet pipe (9) are provided in the fuselage (2). One end of the water inlet pipe (8) and the water outlet pipe (9) pass through the machine head (1) and are respectively connected to the two ends of the cooling channel (7), and the other ends of the water inlet pipe (8) and the water outlet pipe (9) are connected to the cooling device.

5. A closed tube-to-tube welding gun according to claim 1, characterized in that: An air supply ring (10) is arranged in the machine head (1) on the side of the limiting ring (54) away from the gear ring (53), and an air supply channel (11) is provided in the air supply ring (10). An air supply pipe (30) is arranged in the machine body (2), one end of the air supply pipe (30) passes through the machine head (1) and is connected to the air supply channel (11), and the other end of the air supply pipe (30) is connected to the air supply device. A plurality of air supply holes (12) are spaced apart on the side wall of the air supply ring (10) close to the gear ring (53).

6. A closed tube-to-tube welding gun according to claim 5, characterized in that: A first baffle (13) is provided on the side wall of the machine head (1) close to the large-diameter pipe (31), and a second baffle (14) is provided on the side wall of the machine head (1) away from the first baffle (13); the small-diameter pipe (32) passes through the first baffle (13) and the second baffle (14); the first baffle (13) and the second baffle (14) shield the opening of the processing hole (3).

7. A closed tube-to-tube welding gun according to claim 1, characterized in that: A plurality of moving rods (18) are slidably arranged on the side wall of the machine head (1) away from the clamping mechanism (4), the end of the moving rod (18) extends outside the machine head (1), the end of the moving rod (18) outside the machine head (1) is provided with a positioning wheel (19), the positioning wheel (19) abuts against the outer wall of the large-diameter pipe (31), the end of the moving rod (18) away from the positioning wheel (19) is fixedly provided with a non-return rack (20), a plurality of first elastic members (21) are arranged inside the machine head (1), a retaining ring (22) is fixedly arranged on the moving rod (18), the end of the first elastic member (21) close to the positioning wheel (19) abuts against the retaining ring (22), and the machine head (1) A push rod (23) is slidably arranged on the side wall near the clamping mechanism (4), a driving rack (24) is slidably arranged in the machine head (1), the push rod (23) is fixedly connected to the driving rack (24), a first gear (25) is rotatably arranged in the machine head (1), the first gear (25) is meshed with the driving rack (24), a locking mechanism (26) is arranged in the machine head (1) and is transmission-connected to the first gear (25), when the clamping mechanism (4) clamps and fixes the small-diameter pipe (32), the end of the clamping rod (45) pushes the push rod (23) to move, and the push rod (23) drives the locking mechanism (26) through the first gear (25) to lock the plurality of check racks (20).

8. A closed tube-to-tube welding gun according to claim 7, characterized in that: The locking mechanism (26) comprises a synchronous belt (261), a plurality of second gears (262), a screw rod (263), a slider (264), a push block (265) and a locking rack (266); the plurality of second gears (262) are rotatably arranged in the machine head (1) and correspond one to one with the plurality of check racks (20); the synchronous belt (261) is rotatably sleeved on the first gear (25) and the plurality of second gears (262); the plurality of screw rods (263) are coaxially fixedly arranged on the side walls of the plurality of second gears (262); the plurality of sliders (264) are slidably arranged in the machine head (1); The screw rods (263) are threadedly arranged in the plurality of sliders (264), the plurality of locking racks (266) are arranged in the machine head (1) and are located below the plurality of non-return racks (20), the plurality of push blocks (265) are fixedly arranged on the plurality of locking racks (266), the sliders (264) and the push blocks (265) are located in the same plane, and chamfers (27) are formed on the side walls of the sliders (264) and the push blocks (265) that are close to each other. When the locking rack (266) moves upward, the locking rack (266) clamps the non-return rack (20) and locks the positioning wheel (19).

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