A press-fit pipe fitting welding device and welding method

Abstract

The application discloses a kind of clamp pressure pipe fittings welding device and welding method, belong to welding device technical field.Clarke pressure pipe fittings welding device, including support, support is provided with a plurality of for fixing and assembling pipe blank fixing mechanism, the side of fixing mechanism is provided with the welding mechanism for the pipe blank welding;Fixing mechanism includes assembling unit and pressing unit, pressing unit is located above assembling unit, assembling unit includes fixed seat, fixed seat is set on the base of support, rotatingly arranged with rotary table above fixed seat, coaxial upper fixed part and lower fixed part are fixedly arranged on rotary table, lower fixed part is used to fix lower pipe blank, and upper fixed part is used to fix upper pipe blank.Clarke pressure pipe fittings welding device and welding method of the application can solve the problem of complex structure and poor adaptability of existing welding device.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and in particular to a welding device and welding method for press-fit pipe fittings. Background Technology

[0002] In modern industry and construction, pipe connection technology is crucial, and press-fit tubing, as a commonly used pipe connection method, is widely applied. Press-fit tubing involves inserting a fitting into the pipe and using a special tool to compress the pipe, creating a tight connection between the pipe and fitting. The production cost of tee press-fit tubing is relatively high. The production method for tee press-fit tubing often involves welding two press-fit tubing together to form a tee press-fit tubing. The structure of the press-fit tubing before welding is as follows... Figure 1 As shown. Welding of crimped tubes typically involves fixing two crimped tubes together, or pre-fixing them with spot welding, and then welding them together with a welding torch. Manual welding of crimped tubes is not only inefficient but also results in poor alignment quality, affecting the overall quality of the tee crimped tube.

[0003] Existing patent CN202411103097.9 discloses a metal pipe welding device, including a combined device. The combined device includes a base frame and a welding frame. The combined device is used for welding and grinding the pipe fittings front and back. Clamping devices are provided on both sides of the combined device, including clamping frame I and clamping frame II. The clamping devices are used to clamp and rotate the pipe fittings during the conveying process. Conveying devices are provided at both ends of the clamping devices. The conveying devices include multiple auxiliary frames, which are fixedly installed on the base frame. The conveying devices are used to continuously convey the pipe fittings forward. The above patent improves the alignment quality of the pipe fittings and the welding effect by clamping and conveying them through the clamping devices. However, the clamping device in the above patent is a two-part independent structure, which is relatively complex. The welding torch cannot be flexibly adjusted, and the adaptability of the welding device is relatively poor. Furthermore, the above welding device is suitable for welding long pipes and cannot be adapted to welding T-joint crimped pipes. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device and method for press-fit pipe fittings, which solves the problems of complex structure and poor adaptability of existing welding devices.

[0005] To achieve the above objectives, the present invention provides a press-fit pipe fitting welding device, including a support, on which a plurality of fixing mechanisms for fixing and assembling pipe blanks are provided, and a welding mechanism for welding the pipe blanks is provided on one side of the fixing mechanism; the fixing mechanism includes an assembly unit and a pressing unit, the pressing unit being located above the assembly unit, the assembly unit including a fixing seat, the fixing seat being disposed on the base of the support, a rotating platform being rotatably disposed above the fixing seat, and a coaxial upper fixing part and a lower fixing part being fixedly disposed on the rotating platform, the lower fixing part being used to fix the lower pipe blank, and the upper fixing part being used to fix the upper pipe blank.

[0006] Preferably, the lower fixing part includes a lower fixing sleeve, the bottom of which is provided with a positioning platform for positioning the lower tube blank, and the interior of the lower fixing sleeve is provided with a plurality of lower fixing structures arranged in a circumferential array; the lower fixing structure includes a lower top plate, the lower fixing sleeve is provided with a lower clearance groove for avoiding the lower top plate, the interior of the lower fixing sleeve is provided with a lower sliding structure for driving the lower top plate to slide horizontally, and the positioning platform is provided with a limiting groove that guides the sliding of the lower top plate, the limiting groove being located on a straight line passing through the central axis of the lower fixing sleeve.

[0007] Preferably, the sliding structure includes a lifting plate, which is located inside the lower fixed sleeve and slidably connected to it. A first spring is provided between the lifting plate and the bottom of the lower fixed sleeve to apply an upward pushing force to the lifting plate. Several protrusions are threadedly connected to the lifting plate. The top of the lower fixed sleeve is provided with a through hole through which the protrusions pass. The protrusions are slidably connected to the lower fixed sleeve and are located directly below the lower tube blank step surface. A fixing block is provided below the lifting plate. The bottom end of the fixing block is hinged to the middle of the rotating rod. The bottom end of the rotating rod is hinged to the lower top plate. The top end of the rotating rod is hinged to the top end of the lower fixed sleeve through a first connecting rod. An avoidance hole is provided on the lifting plate for the first connecting rod to pass through.

[0008] Preferably, the upper fixing part includes an upper fixing sleeve, which is coaxial with the lower fixing sleeve. The upper fixing sleeve has a plurality of upper fixing structures arranged in a circumferential array inside. The upper fixing structure includes an upper top plate. The upper fixing sleeve has an upper clearance groove that avoids the upper top plate. The upper fixing sleeve has an upper sliding structure that drives the upper top plate to slide horizontally inside.

[0009] Preferably, the upper sliding structure includes a slide rod, a through hole for the slide rod to pass through at the top of the upper fixed sleeve, the slide rod being slidably connected to the upper fixed sleeve, a connecting plate at the bottom of the slide rod, a guide sleeve at the bottom of the connecting plate, a fixed plate fixedly disposed inside the upper fixed sleeve, the fixed plate having a through hole for the guide sleeve to pass through, the guide sleeve being slidably connected to the fixed plate, a second spring for applying an upward pushing force to the connecting plate being disposed between the connecting plate and the fixed plate, the connecting plate being hinged to the slider via a second connecting rod, an upper top plate being fixed on the slider, and a slide rail for limiting and guiding the sliding of the slider being disposed on the fixed plate, the slide rail being located on a straight line passing through the central axis of the upper fixed sleeve.

[0010] Preferably, the pressing unit includes a pressure plate, a pressure head rotatably disposed below the pressure plate, the pressure head being located directly above the upper fixed sleeve, a cylinder for driving the pressure plate to rise and fall on a slide, a guide post for guiding the rise and fall of the pressure plate on the pressure plate, a through hole for the guide post to pass through on the slide, the guide post being slidably connected to the slide; the slide is located between the base and the top seat, a first lead screw is disposed between the top seat and the base, a first motor for driving the first lead screw to rotate is disposed on the top seat, a threaded hole for the first lead screw to pass through and be adapted to the first lead screw is disposed on the slide, a guide rod for guiding the rise and fall of the slide is disposed between the two ends of the base and the top seat, the slide being slidably connected to the guide rod through a through hole.

[0011] Preferably, the welding mechanism includes a lifting platform, a position adjustment structure that drives the lifting platform to move on the base, a mounting plate on the lifting platform, a housing on the mounting plate, a rotating seat rotatably mounted on the outside of the housing, a clamp for clamping the welding torch rotatably mounted on the outside of the rotating seat, and an angle adjustment structure that drives the rotating seat and the clamp to rotate to adjust the angle of the welding torch inside the housing.

[0012] Preferably, the position adjustment structure includes a slide table, a second lead screw rotatably mounted on a base via a bearing, a threaded hole on the slide table for the second lead screw to pass through and be adapted to the second lead screw, a second motor on the base to drive the second lead screw to rotate, and a track on the base to guide the sliding of the slide table; a mounting base is mounted above the slide table, a third lead screw on the slide table to drive the mounting base to slide, the second lead screw and the third lead screw being perpendicular, a motor on the slide table to drive the third lead screw to rotate, and a track on the slide table to guide the sliding of the mounting base; a vertical plate is mounted on the mounting base, a lifting platform slidably mounted on one side of the vertical plate, a track on the vertical plate to guide the sliding of the lifting platform, a screw threadedly connected to the top of the vertical plate, and the bottom end of the screw rotatably connected to the lifting platform.

[0013] Preferably, the angle adjustment structure includes a rotating sleeve, which is fixedly connected to a rotating seat and rotatably connected to a housing. A driven gear is provided on the outer surface of the rotating sleeve, and the driven gear meshes with a driving gear provided inside the housing. A fourth motor that drives the driving gear to rotate is provided inside the housing. A fixing rod is fixed inside the housing, located inside the rotating sleeve and rotatably connected to the rotating sleeve. A first bevel gear is provided at the end of the fixing sleeve, located inside the rotating seat. A chuck is rotatably connected to the rotating seat via a rotating shaft, and a second bevel gear that meshes with the first bevel gear is provided on the rotating shaft.

[0014] The welding method based on the above-mentioned clamping pipe fitting welding device includes the following steps:

[0015] S1. The lower tube blank is fitted outside the lower fixed sleeve, the stepped surface of the lower tube blank is supported on the protruding column, and the upper tube blank is placed above the lower tube blank. The tube opening in the middle of the upper tube blank is fitted outside the upper fixed sleeve.

[0016] S2. The first motor drives the slide block to move downwards via the first lead screw, and the slide block drives the pressure plate to move downwards. The cylinder extends, and the cylinder drives the pressure head to press against the upper tube blank via the pressure plate. The upper tube blank moves downwards, and the upper tube blank drives the lower tube blank to move downwards. The stepped surface of the lower tube blank applies downward pressure to the protrusion, and the protrusion drives the lifting plate to move downwards. The lifting plate drives the rotating rod to move downwards. The rotating rod rotates under the action of the first connecting rod, and the rotating rod drives the lower top plate to slide outwards along the limiting groove. The lower top plate presses against the inner wall of the lower tube blank, fixing the lower tube blank. The top of the upper tube blank applies downward pressure to the connecting plate via the slide rod. The connecting plate drives the slider to slide outwards along the slide rail via the second connecting rod. The slider drives the upper top plate to slide outwards. The upper top plate presses against the inner surface of the upper tube blank, fixing the upper tube blank. The upper tube blank is aligned with the lower tube blank.

[0017] S3. Adjust the position of the lifting platform using the second lead screw, the third lead screw, and the screw rod; start the fourth motor, which drives the rotating sleeve to rotate via the driving gear and the driven gear. The rotating sleeve drives the rotating seat to rotate, and the rotating seat drives the chuck to rotate via the rotating shaft. The rotating shaft drives the second bevel gear to rotate synchronously around the fixed rod. Since the first bevel gear is fixed, the second bevel gear rotates under the action of the first bevel gear. The second bevel gear drives the chuck to rotate via the rotating shaft, thereby adjusting the angle of the welding torch.

[0018] S4. Start the motor inside the fixed base. The motor drives the rotary table to rotate. The rotary table drives the lower tube blank and the upper tube blank to rotate synchronously through the lower fixed sleeve and the upper fixed sleeve. Weld the connection between the upper tube blank and the lower tube blank using a welding torch.

[0019] The advantages and positive effects of the clamping pipe fitting welding device and welding method described in this invention are:

[0020] 1. The present invention is provided with a fixing mechanism. The lower fixing part and the upper fixing part of the fixing mechanism automatically fix and align the lower tube blank and the upper tube blank under the action of the pressure head. Since the upper fixing sleeve and the lower fixing sleeve are coaxially arranged, the alignment quality of the upper tube blank and the lower tube blank is improved, which is beneficial to improving the welding quality of the crimped tube, and the structure is simple.

[0021] 2. In this invention, the upper and lower fixing parts automatically clamp and fix the upper and lower tube blanks under the action of the pressure head. After the pressure head is removed, the welded clamping tube is released under the action of the first and second springs, which facilitates the installation and disassembly of the clamping tube.

[0022] 3. The welding mechanism of the present invention includes a position adjustment structure and an angle adjustment structure for adjusting the welding torch. The position and angle of the welding torch can be adjusted as needed to meet the welding requirements of different shaped compression tubes and improve adaptability.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

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

[0025] Figure 2 This is a front view structural diagram of an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the fixing mechanism according to an embodiment of the present invention;

[0027] Figure 4 This is a partial structural diagram of the fixing mechanism according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of the fixing mechanism according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the lower fixing part structure according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the upper fixing part structure according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the position adjustment structure according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the angle adjustment structure according to an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the internal structure of the angle adjustment structure according to an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the crimp tube structure according to an embodiment of the present invention.

[0035] Figure Labels

[0036] 1. Bracket; 11. Base; 12. Top seat; 13. Slide; 14. First lead screw; 15. First motor; 16. Guide rod;

[0037] 2. Fixing mechanism; 21. Fixing seat; 22. Rotary table; 23. Positioning table; 24. Lower fixing sleeve; 25. Upper fixing sleeve; 26. Lower clearance groove; 27. Lower top plate; 28. Upper clearance groove; 29. ​​Upper top plate; 210. Protruding column; 211. Slide rod; 212. Lifting plate; 213. Fixing block; 214. Rotating rod; 215. First connecting rod; 216. Limiting groove; 217. First spring; 218. Connecting plate; 219. Second connecting rod; 220. Slider; 221. Fixing plate; 222. Slide rail; 223. Guide sleeve; 224. Second spring; 225. Pressure plate; 226. Pressure head; 227. Cylinder; 228. Guide column;

[0038] 3. Welding mechanism; 31. Slide table; 32. Second lead screw; 33. Second motor; 34. Mounting base; 35. Third lead screw; 36. Third motor; 37. Vertical plate; 38. Lifting platform; 39. Screw; 310. Mounting plate; 311. Housing; 312. Rotary seat; 313. Chuck; 314. Welding torch; 315. Rotating sleeve; 316. Driven gear; 317. Driving gear; 318. Fourth motor; 319. Fixed rod; 320. First bevel gear; 321. Rotating shaft; 322. Second bevel gear. Detailed Implementation

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning as set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application. To accurately describe the technical content of this application and to accurately understand the invention, the following explanations or definitions of the terms used in this specification are provided before describing specific embodiments:

[0041] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0042] like Figure 1 , Figure 2 As shown. A welding device for press-fit pipe fittings includes a support 1, on which several fixing mechanisms 2 for fixing and assembling pipe blanks are provided. A welding mechanism 3 for welding the pipe blanks is provided on one side of the fixing mechanism 2. The support 1 includes a base 11, a top seat 12 is provided above the base 11, and a slide 13 is located between the base 11 and the top seat 12. A first lead screw 14 is provided between the top seat 12 and the base 11, and the top and bottom ends of the first lead screw 14 are rotatably connected to the top seat 12 and the base 11 respectively through bearings. A first motor 15 is fixedly provided on the top seat 12 to drive the first lead screw 14 to rotate. The slide 13 is provided with a threaded hole through which the first lead screw 14 passes and is adapted to the first lead screw 14. The first motor 15 drives the slide 13 to move up and down through the first lead screw 14. A guide rod 16 is fixedly provided between the two ends of the base 11 and the top seat 12 to guide the lifting and lowering of the slide 13. The slide block 13 is provided with a through hole through which the guide rod 16 passes, and the slide block 13 is slidably connected to the guide rod 16.

[0043] The fixing mechanism 2 includes an assembly unit and a pressing unit, with the pressing unit located above the assembly unit. The assembly unit is used for assembling and fixing the upper and lower tube blanks, while the pressing unit is used to apply downward pressure, thereby concentrically fixing the upper and lower tube blanks onto the assembly unit.

[0044] like Figure 3 , Figure 4 As shown, the assembly unit includes a fixed base 21, which is fixedly mounted on the base 11 of the bracket 1 by screws. A rotating platform 22 is rotatably mounted above the fixed base 21 via bearings. A motor that drives the rotating platform 22 to rotate is installed inside the fixed base 21. The rotating platform 22 has a coaxial upper fixing part and a lower fixing part fixedly mounted on it. The lower fixing part is used to fix the lower tube blank, and the upper fixing part is used to fix the upper tube blank.

[0045] like Figure 5 , Figure 6 As shown. The lower fixing part includes a lower fixing sleeve 24, and a positioning platform 23 for positioning the lower tube blank is fixedly installed at the bottom of the lower fixing sleeve 24. The lower fixing sleeve 24 has a number of lower fixing structures arranged in a circumferential array inside. The lower fixing structure includes a lower top plate 27, which is an arc shape adapted to the inner wall shape of the lower tube blank and is used to press and fix the lower tube blank. The lower fixing sleeve 24 is provided with a lower clearance groove 26 to avoid the lower top plate 27, and the lower top plate 27 extends out from the lower clearance groove 26. The lower fixing sleeve 24 has a lower sliding structure that drives the lower top plate 27 to slide horizontally. The positioning platform 23 is provided with a limiting groove 216 that guides the sliding of the lower top plate 27. The limiting groove 216 is located on a straight line passing through the central axis of the lower fixing sleeve 24.

[0046] The sliding structure includes a lifting plate 212, which is located inside and slidably connected to the lower fixed sleeve 24. A first spring 217 is provided between the bottom of the lifting plate 212 and the lower fixed sleeve 24 to apply an upward pushing force to the lifting plate 212. Several protrusions 210 are threaded onto the lifting plate 212, and the length of the protrusions 210 from the lower fixed sleeve 24 can be adjusted according to the size of the clamping tube. The top of the lower fixed sleeve 24 is provided with a through hole through which the protrusions 210 pass, and the protrusions 210 are slidably connected to the lower fixed sleeve 24. The protrusions 210 are located directly below the stepped surface of the lower tube blank, causing the lower tube blank to move downward by driving the protrusions 210 through the stepped surface. A fixing block 213 is fixedly provided below the lifting plate 212, and the bottom end of the fixing block 213 is hinged to the middle of the L-shaped rotating rod 214. The bottom end of the rotating rod 214 is hinged to the lower top plate 27, and the top end of the rotating rod 214 is hinged to the top end of the lower fixed sleeve 24 through the first connecting rod 215. The lifting plate 212 is provided with a clearance hole for the first connecting rod 215 to pass through, so as to prevent the lifting plate 212 from affecting the rotation of the first connecting rod 215.

[0047] like Figure 7 As shown. The upper fixing part includes an upper fixing sleeve 25, which is coaxially and fixedly connected to a lower fixing sleeve 24. The upper fixing sleeve 25 has several upper fixing structures arranged in a circumferential array inside. Each upper fixing structure includes an upper top plate 29, which is an arc-shaped plate adapted to the shape of the inner wall of the upper tube blank. The upper fixing sleeve 25 is provided with an upper clearance groove 28 to avoid the upper top plate 29.

[0048] The upper fixed sleeve 25 has an internal upper sliding structure that drives the upper top plate 29 to slide horizontally. The upper sliding structure includes a slide rod 211. The top of the upper fixed sleeve 25 has a through hole through which the slide rod 211 passes, and the slide rod 211 is slidably connected to the upper fixed sleeve 25. The bottom end of the slide rod 211 is threadedly connected to a connecting plate 218, allowing adjustment of the length of the slide rod 211 extending beyond the upper fixed sleeve 25 as needed. The bottom end of the connecting plate 218 is fixedly fitted with a guide sleeve 223, and the bottom end of the slide rod 211 is located inside the guide sleeve 223. The upper fixed sleeve 25 has an internal fixed plate 221 with a through hole through which the guide sleeve 223 passes, and the guide sleeve 223 is slidably connected to the fixed plate 221. A second spring 224 is provided between the connecting plate 218 and the fixed plate 221 to apply an upward pushing force to the connecting plate 218. The connecting plate 218 is hinged to the slider 220 via the second connecting rod 219, and the upper top plate 29 is fixed on the slider 220. The fixed plate 221 is provided with a slide rail 222, which limits and guides the sliding of the slider 220. The slide rail 222 is located on a straight line passing through the central axis of the upper fixed sleeve 25.

[0049] The pressing unit includes a pressure plate 225. A pressure head 226 is rotatably mounted below the pressure plate 225 via a bearing, allowing the pressure head 226 to rotate synchronously with the tube blank, improving the stability of pressing the tube blank. The pressure head 226 is located directly above the upper fixed sleeve 25. A cylinder 227 is fixedly mounted on the slide 13 to drive the pressure plate 225 to rise and fall. A guide post 228 is fixedly mounted on the pressure plate 225 to guide its rising and falling. The slide 13 has a through hole through which the guide post 228 passes, and the guide post 228 is slidably connected to the slide 13.

[0050] like Figure 8As shown. The welding mechanism 3 includes a lifting platform 38, and a position adjustment structure for moving the lifting platform 38 is provided on the base 11. The position adjustment structure includes a slide 31, and a second lead screw 32 is rotatably mounted on the base 11 via a bearing. The slide 31 has a threaded hole through which the second lead screw 32 passes and is adapted to the second lead screw 32. A second motor 33 for rotating the second lead screw 32 is provided on the base 11. A guide rail for guiding the sliding of the slide 31 is fixedly provided on the base 11. A mounting base 34 is provided above the slide 31, and a third lead screw 35 for sliding the mounting base 34 is rotatably mounted on the slide 31 via a bearing. The second lead screw 32 is perpendicular to the third lead screw 35. A third motor 36 for rotating the third lead screw 35 is fixedly provided on the slide 31. A guide rail for guiding the sliding of the mounting base 34 is fixedly provided on the slide 31. A vertical plate 37 is fixedly provided on the mounting base 34, and the lifting platform 38 is slidably mounted on one side of the vertical plate 37. A guide rail is fixedly installed on the upright plate 37 to guide the sliding of the lifting platform 38. A screw 39 is threadedly connected to the top of the upright plate 37, and the bottom end of the screw 39 is rotatably connected to the lifting platform 38 via a bearing. The screw 39 is perpendicular to the second lead screw 32 and the third lead screw 35, and the position of the lifting platform 38 is adjusted by the screw 39, the second lead screw 32, and the third lead screw 35.

[0051] like Figure 9 As shown, a mounting plate 310 is fixedly mounted on the lifting platform 38 by screws. A housing 311 is fixedly mounted on the mounting plate 310, and a rotating seat 312 is rotatably mounted on the outside of the housing 311. A chuck 313 for clamping the welding torch 314 is rotatably mounted on the outside of the rotating seat 312. The chuck 313 includes a fixed head and a movable head, which are fixed by screws to facilitate the installation and removal of the welding torch 314.

[0052] like Figure 10As shown. The housing 311 contains an angle adjustment structure that adjusts the angle of the welding torch 314 by rotating the rotating base 312 and the chuck 313. The angle adjustment structure includes a rotating sleeve 315, which is fixedly connected to the rotating base 312. The rotating sleeve 315 is rotatably connected to the housing 311 via bearings. A driven gear 316 is fixedly mounted on the outer surface of the rotating sleeve 315, meshing with a driving gear 317 located inside the housing 311. A fourth motor 318, which drives the driving gear 317, is located inside the housing 311. A fixing rod 319 is fixedly mounted inside the housing 311, located inside the rotating sleeve 315 and rotatably connected to the rotating sleeve 315 via bearings. A first bevel gear 320 is fixedly mounted at the end of the fixing sleeve, located inside the rotating base 312. A rotating shaft 321 is fixedly mounted on the chuck 313, and the rotating shaft 321 is rotatably connected to the rotating base 312 via bearings. A second bevel gear 322 that meshes with the first bevel gear 320 is fixedly mounted on the rotating shaft 321.

[0053] The welding method of the above-mentioned press-fit pipe fitting welding device includes the following steps:

[0054] S1. The lower tube blank is fitted onto the outside of the lower fixed sleeve 24, and the stepped surface of the lower tube blank is supported on the protruding post 210. The upper tube blank is placed on top of the lower tube blank, and the tube opening in the middle of the upper tube blank is fitted onto the outside of the upper fixed sleeve 25.

[0055] S2. The first motor 15 drives the slide block 13 downward via the first lead screw 14, and the slide block 13 drives the pressure plate 225 downward. The cylinder 227 extends, and the cylinder 227 drives the pressure head 226 to press on the upper tube blank via the pressure plate 225. The upper tube blank moves downward, and the upper tube blank drives the lower tube blank to move downward. The stepped surface of the lower tube blank applies downward pressure to the protrusion 210. The protrusion 210 drives the lifting plate 212 to move downward, and the first spring 217 is compressed. The lifting plate 212 drives the rotating rod 214 to move downward. The rotating rod 214 rotates under the action of the first connecting rod 215. The rotating rod 214 drives the lower top plate 27 to slide outward along the limiting groove 216. The lower top plate 27 presses against the inner wall surface of the lower tube blank to fix the lower tube blank. The top of the upper tube blank applies downward pressure to the connecting plate 218 via the slide rod 211. The connecting plate 218 drives the slider 220 to slide outward along the slide rail 222 via the second connecting rod 219. The slider 220 drives the upper top plate 29 to slide outward, and the upper top plate 29 presses against the inner surface of the upper tube blank, thus fixing the upper tube blank. The upper tube blank is aligned with the lower tube blank.

[0056] S3. Adjust the position of the lifting platform 38 using the second lead screw 32, the third lead screw 35, and the screw 39. Start the fourth motor 318. The fourth motor 318 drives the rotating sleeve 315 to rotate via the driving gear 317 and the driven gear 316. The rotating sleeve 315 drives the rotating seat 312 to rotate. The rotating seat 312 drives the chuck 313 to rotate via the rotating shaft 321. The rotating shaft 321 drives the second bevel gear 322 to rotate synchronously around the fixed rod 319. Since the first bevel gear 320 is fixed, when the second bevel gear 322 rotates around the fixed rod 319, it rotates on its own axis under the action of the first bevel gear 320. The second bevel gear 322 drives the chuck 313 to rotate via the rotating shaft 321, thereby adjusting the angle of the welding torch 314.

[0057] S4. Start the motor inside the fixed base 21. The motor drives the rotary table 22 to rotate. The rotary table 22 drives the lower tube blank and the upper tube blank to rotate synchronously through the lower fixed sleeve 24 and the upper fixed sleeve 25. Weld the connection between the upper tube blank and the lower tube blank through the welding gun 314.

[0058] After welding is completed, the motor stops rotating, the cylinder 227 retracts, and the cylinder 227 drives the pressure head 226 to move upward through the pressure plate 225. The first spring 217 and the second spring 224 return to their original positions. Under the action of the first spring 217 and the second spring 224, the lower top plate 27 and the upper top plate 29 retract into the lower fixed sleeve 24 and the upper fixed sleeve 25 respectively, making it easier to remove the welded clamping tube from the rotary table 22.

[0059] Therefore, the welding device and welding method for press-fit pipe fittings described in this invention can solve the problems of complex structure and poor adaptability of existing welding devices.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A crimping pipe fitting welding device, characterized in that: The system includes a support frame with several fixing mechanisms for fixing and assembling tube blanks. One side of each fixing mechanism has a welding mechanism for welding the tube blanks. Each fixing mechanism includes an assembly unit and a pressing unit. The pressing unit is located above the assembly unit. The assembly unit includes a fixing seat, which is mounted on the base of the support frame. A rotating platform is rotatably mounted above the fixing seat. A coaxial upper fixing part and a lower fixing part are fixedly mounted on the rotating platform. The lower fixing part is used to fix the lower tube blank, and the upper fixing part is used to fix the upper tube blank. The lower fixing part includes a lower fixing sleeve, and a positioning platform is provided at the bottom of the lower fixing sleeve for positioning the lower tube blank. The lower fixing sleeve has a number of lower fixing structures arranged in a circumferential array inside. The lower fixing structure includes a lower top plate. The lower fixing sleeve has a lower clearance groove to avoid the lower top plate. The lower fixing sleeve has a lower sliding structure to drive the lower top plate to slide horizontally inside. The positioning platform has a limiting groove that guides the sliding of the lower top plate. The limiting groove is located on a straight line passing through the central axis of the lower fixing sleeve. The sliding structure includes a lifting plate, which is located inside the lower fixed sleeve and slidably connected to it. A first spring is provided between the bottom of the lifting plate and the lower fixed sleeve to apply an upward pushing force to the lifting plate. Several protrusions are threadedly connected to the lifting plate. A through hole is provided at the top of the lower fixed sleeve for the protrusions to pass through. The protrusions are slidably connected to the lower fixed sleeve and are located directly below the lower tube blank step surface. A fixing block is provided below the lifting plate. The bottom end of the fixing block is hinged to the middle of the rotating rod. The bottom end of the rotating rod is hinged to the lower top plate. The top end of the rotating rod is hinged to the top end of the lower fixed sleeve through a first connecting rod. An avoidance hole is provided on the lifting plate for the first connecting rod to pass through. The upper fixing part includes an upper fixing sleeve, which is coaxial with the lower fixing sleeve. The upper fixing sleeve has a number of upper fixing structures arranged in a circular array inside. The upper fixing structure includes an upper top plate. The upper fixing sleeve has an upper clearance groove to avoid the upper top plate. The upper fixing sleeve has an upper sliding structure inside to drive the upper top plate to slide horizontally.

2. The clamping pipe fitting welding device according to claim 1, characterized in that: The upper sliding structure includes a slide rod, a through hole at the top of the upper fixed sleeve for the slide rod to pass through, the slide rod being slidably connected to the upper fixed sleeve, a connecting plate at the bottom of the slide rod, a guide sleeve at the bottom of the connecting plate, a fixed plate fixedly installed inside the upper fixed sleeve, the fixed plate having a through hole for the guide sleeve to pass through, the guide sleeve being slidably connected to the fixed plate, a second spring between the connecting plate and the fixed plate for applying an upward pushing force to the connecting plate, the connecting plate being hinged to the slider via a second connecting rod, an upper top plate fixed to the slider, and a slide rail on the fixed plate for limiting and guiding the sliding of the slider, the slide rail being located on a straight line passing through the central axis of the upper fixed sleeve.

3. The clamping pipe fitting welding device according to claim 2, characterized in that: The pressing unit includes a pressure plate, a pressure head rotatably mounted below the pressure plate, the pressure head being directly above the upper fixed sleeve, a cylinder mounted on a slide to drive the pressure plate to rise and fall, a guide post mounted on the pressure plate to guide the rise and fall of the pressure plate, a through hole on the slide for the guide post to pass through, and the guide post being slidably connected to the slide; the slide is located between the base and the top seat, a first lead screw is mounted between the top seat and the base, a first motor mounted on the top seat to drive the first lead screw to rotate, a threaded hole on the slide for the first lead screw to pass through and to be adapted to the first lead screw, and a guide rod is mounted between the two ends of the base and the top seat to guide the rise and fall of the slide, a through hole on the slide for the guide rod to pass through, and the slide being slidably connected to the guide rod.

4. The clamping pipe fitting welding device according to claim 3, characterized in that: The welding mechanism includes a lifting platform, a position adjustment structure on the base that drives the lifting platform to move, a mounting plate on the lifting platform, a housing on the mounting plate, a rotating seat on the outside of the housing, a clamp for clamping the welding torch on the outside of the rotating seat, and an angle adjustment structure inside the housing that drives the rotating seat and the clamp to rotate to adjust the angle of the welding torch.

5. The clamping pipe fitting welding device according to claim 4, characterized in that: The position adjustment structure includes a slide table, a second lead screw rotatably mounted on a base via bearings, a threaded hole on the slide table for the second lead screw to pass through and be adapted to the second lead screw, a second motor on the base to drive the second lead screw to rotate, and a guide rail on the base to guide the sliding of the slide table; a mounting base is mounted above the slide table, a third lead screw on the slide table to drive the mounting base to slide, the second lead screw and the third lead screw being perpendicular, a motor on the slide table to drive the third lead screw to rotate, and a guide rail on the slide table to guide the sliding of the mounting base; a vertical plate is mounted on the mounting base, a lifting platform slidably mounted on one side of the vertical plate, a guide rail on the vertical plate to guide the sliding of the lifting platform, a screw threadedly connected to the top of the vertical plate, and the bottom end of the screw rotatably connected to the lifting platform.

6. The clamping pipe fitting welding device according to claim 5, characterized in that: The angle adjustment structure includes a rotating sleeve, which is fixedly connected to a rotating seat and rotatably connected to a housing. A driven gear is provided on the outer surface of the rotating sleeve, and the driven gear meshes with a driving gear provided inside the housing. A fourth motor that drives the driving gear to rotate is provided inside the housing. A fixed rod is fixed inside the housing, located inside the rotating sleeve and rotatably connected to the rotating sleeve. A first bevel gear is provided at the end of the fixed sleeve, located inside the rotating seat. A chuck is rotatably connected to the rotating seat via a rotating shaft, and a second bevel gear that meshes with the first bevel gear is provided on the rotating shaft.

7. A welding method based on the clamping pipe fitting welding device according to claim 6, characterized in that, Includes the following steps: S1. The lower tube blank is fitted outside the lower fixed sleeve, the stepped surface of the lower tube blank is supported on the protruding column, and the upper tube blank is placed above the lower tube blank. The tube opening in the middle of the upper tube blank is fitted outside the upper fixed sleeve. S2. The first motor drives the slide block to move downwards via the first lead screw, and the slide block drives the pressure plate to move downwards. The cylinder extends, and the cylinder drives the pressure head to press against the upper tube blank via the pressure plate. The upper tube blank moves downwards, and the upper tube blank drives the lower tube blank to move downwards. The stepped surface of the lower tube blank applies downward pressure to the protrusion, and the protrusion drives the lifting plate to move downwards. The lifting plate drives the rotating rod to move downwards. The rotating rod rotates under the action of the first connecting rod, and the rotating rod drives the lower top plate to slide outwards along the limiting groove. The lower top plate presses against the inner wall of the lower tube blank, fixing the lower tube blank. The top of the upper tube blank applies downward pressure to the connecting plate via the slide rod. The connecting plate drives the slider to slide outwards along the slide rail via the second connecting rod. The slider drives the upper top plate to slide outwards. The upper top plate presses against the inner surface of the upper tube blank, fixing the upper tube blank. The upper tube blank is aligned with the lower tube blank. S3. Adjust the position of the lifting platform using the second lead screw, the third lead screw, and the screw rod; start the fourth motor, which drives the rotating sleeve to rotate via the driving gear and the driven gear. The rotating sleeve drives the rotating seat to rotate, and the rotating seat drives the chuck to rotate via the rotating shaft. The rotating shaft drives the second bevel gear to rotate synchronously around the fixed rod. Since the first bevel gear is fixed, the second bevel gear rotates under the action of the first bevel gear. The second bevel gear drives the chuck to rotate via the rotating shaft, thereby adjusting the angle of the welding torch. S4. Start the motor inside the fixed base. The motor drives the rotary table to rotate. The rotary table drives the lower tube blank and the upper tube blank to rotate synchronously through the lower fixed sleeve and the upper fixed sleeve. Weld the connection between the upper tube blank and the lower tube blank using a welding torch.

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