A welding device for pipe butt joint

Abstract

The present application relates to the technical field of welding device, especially to a pipe butt joint welding device, which comprises a base, two supports fixedly connected to the base on both sides in the transverse direction, a rail frame slidingly connected to each support in the transverse direction, a support vertically slidingly connected to each rail frame, a semicircular frame slidingly connected to each support, an electric welding gun fixedly connected to the end of each semicircular frame, a guide rail fixedly connected to the base in the longitudinal direction, two moving frames slidingly connected to the guide rail, a rotating frame rotatably connected to each moving frame, and an extension frame radially slidingly connected to the rotating frame. The present application can adapt to various non-linear angle butt joint scenes of pipes through the multi-degree-of-freedom cooperative adjustment of the moving frame, the rotating frame and the extension frame, and solve the problem that the existing equipment can only be adapted to linear butt joint and has limited applicability. Meanwhile, the two electric welding guns and the semicircular frames arranged in a staggered manner can realize synchronous girth welding, which can effectively improve the work efficiency while ensuring the uniformity and consistency of welding.

Description

Technical Field

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

[0002] To improve operational efficiency, the industry has introduced various automated welding equipment suitable for pipe butt welding in recent years. These devices primarily achieve mechanized welding of circumferential welds by rotating the welding torch or moving the workpiece, thus replacing manual operation to some extent and improving efficiency. However, the structural design and motion control logic of these devices are all centered around circumferential welding, with their clamping mechanisms and welding torch oscillation paths optimized for coaxial butt welding. When actual engineering projects require non-linear butt welding of pipes at angles, these devices cannot adjust the pipe clamping azimuth angle and struggle to maintain stable extension length and tilt angle, thus hindering reliable welding. Therefore, current automated welding devices are significantly less suitable for butt welding scenarios involving multiple angles and various forms of pipe butt welding. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a welding device that can adapt to various docking angles for pipe fittings, thereby improving the applicability and operational flexibility of the welding device.

[0004] The technical implementation of the present invention is as follows: a welding device for pipe fittings, comprising: a base; supports fixedly connected to both sides of the base laterally; a rail frame slidably connected to each support laterally, and configured with a linear drive structure for driving the rail frame to reciprocate laterally; a bracket slidably connected to each rail frame vertically, and configured with a linear drive structure for driving the bracket to reciprocate vertically; a semi-circular arc frame slidably connected to each bracket, and configured with an arc drive structure to drive the semi-circular arc frame to slide circumferentially around its own center point, with the two semi-circular arc frames staggered laterally; and welding guns fixedly connected to the ends of each semi-circular arc frame, with two welding guns respectively... The working surfaces of the two components are located on the upper and lower edges of the corresponding semi-circular arc frame, and their working surfaces are located in the same horizontal plane. A guide rail extending longitudinally is fixedly connected to the base. Two sets of movable frames are slidably connected to the guide rail. A linear drive structure for driving the movable frames to reciprocate longitudinally is configured inside the base. A rotating frame is rotatably connected to each movable frame and is configured with an angular displacement drive structure for driving the rotating frame to rotate about its axis of rotation in the forward and reverse directions with respect to the movable frame. A telescopic frame is radially slidably connected to the rotating frame and is configured with a linear drive structure for driving the telescopic frame to reciprocate radially relative to the rotating frame. Each telescopic frame is equipped with a clamping mechanism for clamping and fixing pipe fittings.

[0005] Optionally, the clamping mechanism includes: a fixed frame fixedly connected to a telescopic frame; a movable ring axially slidably connected to the fixed frame and configured with a linear drive structure for driving the movable ring to reciprocate axially; a fixed cylinder rotatably connected to the movable ring and configured with a rotary drive structure for driving the fixed cylinder to rotate around its own axis; a first connecting arm rotatably connected to the outer periphery of the fixed cylinder; a pad rotatably connected to the end of the first connecting arm; at least three pads symmetrically arranged along the circumference of the fixed cylinder, and each pad is connected to the fixed cylinder through at least two first connecting arms; a telescopic drive structure for driving each pad to uniformly expand and contract is provided between the fixed cylinder and each pad.

[0006] Optionally, the arc drive structure of each semicircular frame includes: a first gear rotatably connected to the bracket; a semi-gear ring fixedly connected to each semicircular frame, the semi-gear ring meshing with the first gear; and a first motor fixedly connected to the bracket, the output shaft of which is coaxially fixedly connected to the first gear.

[0007] Optionally, the linear drive structure corresponding to each bracket, the linear drive structure corresponding to each movable frame, the linear drive structure corresponding to each telescopic frame, and the linear drive structure of the movable ring all adopt a motor screw structure.

[0008] Optionally, the linear drive structure of the two side rail frames adopts a motor screw structure and the two share a common set. The structure includes: a bidirectional screw rotatably connected between the base and the two side supports, wherein the threads on both sides of the bidirectional screw are respectively engaged with the threads of the rail frame on the corresponding side; a second motor is fixedly connected to one side support, and its output shaft is coaxially fixedly connected to the bidirectional screw.

[0009] Optionally, a fixed seat is fixedly connected to the middle of the base; the angular displacement drive structure corresponding to each rotating frame includes: two moving blocks slidably disposed on the base, and respectively disposed on the lateral sides of the rotating frame; each moving block is rotatably connected to the rotating frame with a support arm; a fourth screw is symmetrically rotatably connected to both sides of the moving frame, and the fourth screw on both sides is threadedly engaged with the moving block on the same side; a spline rod is symmetrically rotatably connected to both sides of the base, and the spline rod is splinedly engaged with the fourth screw; a fifth motor is fixedly connected inside the fixed seat; a transmission rod is rotatably connected inside the fixed seat; a bevel gear is provided between the fifth motor, the transmission rod and the spline rod, and the fifth motor drives the spline rods on both sides to rotate synchronously through the transmission rod and the bevel gear.

[0010] Optionally, the telescopic drive structure of the pad includes: an electric push rod fixedly connected inside the fixed cylinder; a drive block fixedly connected to the end of the telescopic shaft of the electric push rod; and a second connecting arm rotatably connected to each pad corresponding to the drive block.

[0011] Optionally, the rotation drive structure of the fixed cylinder adopts a motor gear set structure, and the gear set has a reduction transmission ratio.

[0012] The present invention has the following advantages: The present invention can adapt to various non-linear angle docking scenarios of pipe fittings through the multi-degree-of-freedom coordinated adjustment of the moving frame, rotating frame and telescopic frame, solving the problem that the existing equipment can only be adapted to linear docking and has limited applicability; at the same time, the two welding guns cooperate with the staggered semi-circular arc frame to achieve synchronous circumferential welding, which effectively improves the work efficiency while ensuring the uniformity and consistency of welding.

[0013] This invention, through stepless adjustment of the position of the movable frame and the support, as well as the stepless adjustment of the angle of the rotating frame, can jointly ensure the accuracy of pipe fitting connection and effectively avoid the adverse effects of weld defects on welding quality.

[0014] In this invention, the clamping mechanism achieves rapid clamping and precise positioning of pipe fittings through tension-type centering and rotation adjustment functions. Combined with a multi-degree-of-freedom adjustment system, it can adapt to various angle docking requirements, significantly improving the versatility and operational efficiency of this invention.

[0015] In this invention, the clamping mechanism achieves rapid centering and fixing through pneumatic tensioning. Combined with the drivable forward and backward structure of the fixed cylinder and the adjustment structure that rotates around its own axis, it can stably clamp pipe fittings of different diameters and accurately adjust their circumferential phase, thereby improving the convenience of operation and the consistency of welding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structural state of the welded pipe fittings in this invention.

[0018] Figure 3 This is a schematic diagram showing the position and structure of the welding gun and clamping mechanism in this invention.

[0019] Figure 4 This is a schematic diagram of the connection structure of the welding gun, the semi-circular frame and its arc driving structure in this invention.

[0020] Figure 5 This is a schematic diagram of the connection structure of the mobile frame and its linear drive structure in this invention.

[0021] Figure 6 This is a schematic diagram of the connection structure of the rotating frame and its angular displacement driving structure in this invention.

[0022] Figure 7 This is a cross-sectional view of the connection structure of the telescopic frame and its linear drive structure in this invention.

[0023] Figure 8 This is a schematic diagram of the overall structure of the clamping mechanism in this invention.

[0024] Figure 9This is a cross-sectional view of the connection structure of the pad and its telescopic drive structure in this invention.

[0025] Figure 10 This is a schematic diagram of the connection structure between the fixed cylinder and its rotational drive structure, and the moving ring and its linear drive structure in this invention.

[0026] Meaning of reference numerals in the diagram: 00: Pipe fitting, 101: Base, 102: Support, 103: Rail frame, 104: Bracket, 105: Semi-circular frame, 106: Welding gun, 107: First gear, 108: Semi-gear ring, 109: First motor, 110: Guide rod, 111: Bidirectional screw, 112: Second motor, 113: First screw, 114: Third motor, 201: Guide rail, 202: Moving frame, 203: Rotating frame, 204: Telescopic frame, 205: Second screw, 206: Fourth motor, 207: Moving block, 208: Support arm, 209: ... Four screws, 210: fixed base, 211: spline rod, 212: fifth motor, 213: transmission rod, 214: bevel gear, 215: fifth screw, 216: sixth motor, 30: clamping mechanism, 301: fixed frame, 302: moving ring, 303: fixed cylinder, 304: first connecting arm, 305: pad block, 306: electric push rod, 307: drive block, 308: second connecting arm, 309: sixth screw, 310: seventh motor, 311: second gear, 312: gear plate, 313: eighth motor, 314: third gear, 315: fourth gear. Detailed Implementation

[0027] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Example: A welding device for butt welding of pipe fittings, such as Figures 1-3As shown, it includes: a base 101, the overall structure of which is long in the longitudinal direction and short in the transverse direction; supports 102 are fixedly installed on both sides of the base 101 in the transverse direction; a rail frame 103 is slidably installed on each support 102 in the transverse direction, and is equipped with a linear drive structure for driving the rail frame 103 to reciprocate in the transverse direction; a bracket 104 is slidably installed on each rail frame 103 in the transverse direction, and is equipped with a linear drive structure for driving the bracket 104 to reciprocate in the vertical direction; a semi-circular arc frame 105 is slidably installed on each bracket 104 in the transverse direction, and is equipped with an arc drive structure to drive the semi-circular arc frame 105 to slide in a circle with its own center point as the center, and the two semi-circular arc frames 105 are staggered in the transverse direction to avoid motion interference; an electric welding gun 106 is fixedly installed at the end of each semi-circular arc frame 105, and the two electric welding guns 106 are respectively set The upper and lower edges of the corresponding semi-circular arc frame 105 are located in the same transverse plane; a longitudinally extending guide rail 201 is fixedly installed on the base 101; two sets of movable frames 202 are slidably installed on the guide rail 201; a linear drive structure for driving the movable frames 202 to reciprocate longitudinally is configured inside the base 101; a rotating frame 203 is rotatably installed on each movable frame 202, and an angular displacement drive structure for driving the rotating frame 203 to rotate about its axis of rotation in the positive and negative directions relative to the movable frame 202 is configured; a telescopic frame 204 is radially slidably installed on the rotating frame 203, and a linear drive structure for driving the telescopic frame 204 to reciprocate radially relative to the rotating frame 203 is configured; a clamping mechanism 30 for clamping and fixing the pipe fitting 00 is provided on each telescopic frame 204.

[0029] In use, the two pipe fittings 00 to be joined are first clamped and fixed on the two sets of clamping mechanisms 30 respectively; then, the rotating frame 203 is rotated according to the required welding angle to adjust each pipe fitting 00 to the target posture. Then, the spatial position of each pipe fitting 00 is precisely adjusted by the radial movement of the telescopic frame 204 and the longitudinal movement of the moving frame 202, so that the ends of the two pipe fittings 00 to be welded are accurately joined. That is, this device can flexibly adjust and fix the pipe fittings 00 to complete the loading according to different welding angle requirements. After the loading is completed, the drive rail frame 103 moves laterally relative to the support 102 and the drive bracket 104 moves vertically relative to the rail frame 103, so that the two welding guns 106 move to the welding position of the pipe fittings 00; after each welding gun 106 is in place, the drive semi-circular frame 105 slides, causing the welding guns 106 to make a circular motion around the joint between the pipe fittings 00, and the two welding guns 106 respectively complete the welding operation on half of the pipe fittings 00. During the welding process, the two semi-circular arc frames 105 do not interfere with each other due to their lateral staggered arrangement. The two welding guns 106 are spatially staggered but cooperate with each other, so as to achieve continuous and uniform welding of the weld seam of the pipe fitting 00 around the whole circle. The welding quality is stable and the operation efficiency is high.

[0030] This device, through the multi-degree-of-freedom coordinated adjustment of the movable frame 202, the rotating frame 203 and the telescopic frame 204, can adapt to more than 00 non-linear angle docking scenarios for pipe fittings, solving the problem that existing equipment can only be adapted to linear docking and has limited applicability; at the same time, two welding guns 106 work with the staggered semi-circular arc frame 105 to achieve synchronous circumferential welding, which improves work efficiency while ensuring welding uniformity and consistency.

[0031] like Figure 4 As shown, the linear drive structure of the two side rail frames 103 adopts a motor-screw structure, and the two share a common set. This structure includes: a bidirectional screw 111 rotatably installed between the base 101 and the two side supports 102, the threads on both sides of the bidirectional screw 111 respectively engaging with the threads of the corresponding side rail frame 103, thereby realizing the synchronous reverse movement of the two side rail frames 103; a second motor 112 is fixedly installed on one side support 102, and its output shaft is coaxially fixedly connected to the bidirectional screw 111; a guide rod 110 is fixedly installed on each support 102, slidingly engaging with the corresponding rail frame 103 to enhance movement stability. When the second motor 112 is started, the bidirectional screw 111 rotates, thereby driving the two side rail frames 103 to move synchronously in opposite directions.

[0032] like Figure 4 As shown, the linear drive structure corresponding to each bracket 104 adopts a motor-screw structure, including: a first screw 113 rotatably mounted on the rail frame 103, which is threadedly engaged with the bracket 104; a third motor 114 is fixedly mounted on the top of the rail frame 103, and its output shaft is coaxially and fixedly connected to the top end of the first screw 113. Starting the third motor 114 drives the first screw 113 to rotate, thereby achieving stepless adjustment of the position of the bracket 104.

[0033] like Figure 4 As shown, the arc drive structure of each semicircular arc frame 105 includes: a first gear 107 rotatably mounted on a bracket 104; a semi-gear ring 108 fixedly mounted on each semicircular arc frame 105, which meshes with the first gear 107; and a first motor 109 fixedly mounted on the bracket 104, whose output shaft is coaxially and fixedly connected to the first gear 107. When the first motor 109 is started, it drives the semi-gear ring 108 to rotate through the meshing of the first gear 107, thereby causing the semicircular arc frame 105 to perform a stable circular motion.

[0034] like Figure 5 and Figure 6As shown, the linear drive structure corresponding to each movable frame 202 adopts a motor-screw structure, including: a second screw 205 rotatably installed in the base 101, which is threadedly engaged with the movable frame 202; a fourth motor 206 is fixedly installed on the side wall of the base 101, and its output shaft is coaxially and fixedly connected to the second screw 205. When the fourth motor 206 is started, the second screw 205 rotates, realizing stepless adjustment of the position of the movable frame 202.

[0035] like Figures 5-7 As shown, a fixed seat 210 is fixedly installed in the middle of the base 101; the angular displacement driving structure corresponding to each rotating frame 203 includes: two moving blocks 207 slidably disposed on the base 101, and respectively disposed on the lateral sides of the rotating frame 203; each moving block 207 is rotatably mounted with a support arm 208 between it and the rotating frame 203, so as to convert the reciprocating motion of the moving block 207 into the forward and reverse rotation of the rotating frame 203; a fourth screw 209 is symmetrically rotatably mounted on both sides of the moving frame 202, and the fourth screw 209 on both sides is threadedly engaged with the moving block 207 on the same side; a spline rod 211 is symmetrically rotatably mounted on both sides of the base 101, and the spline rod 211 is threadedly engaged with the fourth screw 209. The 9-spindle joint allows the fourth screw 209 to move freely longitudinally while transmitting rotational power; the fifth motor 212 is fixedly installed in the fixed base 210; the transmission rod 213 is rotatably installed in the fixed base 210; bevel gears 214 are installed on the output shaft of the fifth motor 212, the middle and both ends of the transmission rod 213, and the shaft ends of the two spline rods 211 facing the fixed base 210. The bevel gear 214 on the output shaft of the fifth motor 212 meshes with the bevel gear 214 in the middle of the transmission rod 213, and the bevel gears 214 at both ends of the transmission rod 213 mesh with the bevel gears 214 at the ends of the two spline rods 211, respectively, to realize the synchronous rotation drive of the two spline rods 211.

[0036] The fifth motor 212 is started, and through the bevel gear 214, the transmission rod 213 and the splined rods 211 on both sides rotate synchronously. The splined rods 211 drive the fourth screw 209 to rotate, driving the moving block 207 to precise displacement. Through the transmission of the support arm 208, the rotating frame 203 can achieve stepless angle adjustment, and the transmission structure is symmetrical and the force transmission is smooth. During the longitudinal movement of the moving frame 202, the fourth screw 209 slides relative to the splined rod 211, and the effective transmission of rotational power at any position is always ensured by the cooperation of the splined structure between the two.

[0037] like Figure 7As shown, the linear drive structure corresponding to each telescopic frame 204 adopts a motor-screw structure, including: fifth screws 215 rotatably mounted on both sides of the rotating frame 203, both fifth screws 215 being threadedly engaged with the telescopic frame 204, and equipped with a transmission belt assembly to achieve synchronous rotation; a sixth motor 216 is fixedly installed inside the rotating frame 203, and its output shaft is coaxially and fixedly connected to one of the fifth screws 215. Starting the sixth motor 216 drives the fifth screws 215 on both sides to rotate synchronously via the transmission belt assembly, providing a stable radial displacement of the telescopic frame 204 relative to the rotating frame 203, and the adjustment process is stepless.

[0038] In summary, compared to existing equipment that is only suitable for straight-line docking, this device can flexibly adapt to the docking requirements of pipe fittings at various angles through multi-degree-of-freedom coordinated adjustment, thereby improving applicability and operational reliability. In addition, the stepless adjustment of the positions of the moving frame 202 and the support 104, as well as the stepless adjustment of the angle of the rotating frame 203, can jointly ensure the accuracy of pipe fitting docking and effectively avoid the adverse effects of weld defects on welding quality.

[0039] like Figures 8-10 As shown, the clamping mechanism 30 includes: a fixed frame 301 fixedly mounted on the telescopic frame 204; a movable ring 302 axially slidably mounted on the fixed frame 301, and configured with a linear drive structure for driving the movable ring 302 to reciprocate axially; a fixed cylinder 303 rotatably mounted on the movable ring 302, and configured with a rotary drive structure for driving the fixed cylinder 303 to rotate around its own axis; a first connecting arm 304 rotatably mounted on the outer periphery of the fixed cylinder 303; a pad 305 rotatably mounted at the end of the first connecting arm 304; at least three pads 305 symmetrically arranged along the circumference of the fixed cylinder 303, and each pad 305 is connected to the fixed cylinder 303 by at least two first connecting arms 304; a telescopic drive structure for driving each pad 305 to uniformly expand and contract is provided between the fixed cylinder 303 and each pad 305.

[0040] In use, firstly, each pad 305 is driven to retract, making its overall outer diameter smaller than the inner diameter of the pipe fitting 00 to be welded. Then, the pipe fitting 00 is placed on the outside of each pad 305, and then each pad 305 is driven to open synchronously. The radial tension force reliably fixes the pipe fitting 00 on the clamping mechanism 30, and at the same time, automatic centering is achieved, so that the subsequent movement trajectory of the welding gun 106 can be easily adjusted to precisely match the weld position. After welding is completed, the pad 305 is controlled to retract to release the tension, and the moving ring 302 is driven to drive the fixed cylinder 303 to retract into the fixed frame 301, so that each pad 305 completely exits from the inner hole of the pipe fitting 00, and the welded pipe fitting 00 can be easily unloaded. This unloading process does not require adjustment of the position of the rotating frame 203 and the moving frame 202, which facilitates continuous operation of the same batch of pipe fittings 00, avoids repeated alignment adjustments, and is simple and efficient to operate. In addition, when installing the pipe fitting 00, the pipe fitting 00 can be adjusted to the target docking angle first by using the rotating frame 203 and the telescopic frame 204, and then the fixed cylinder 303 can be rotated by the rotating drive structure to adjust the circumferential phase of the pipe fitting 00. There is no need to deliberately maintain the angle during the clamping process, which further improves the ease of operation.

[0041] In this device, the clamping mechanism 30 achieves rapid clamping and precise positioning of the pipe fitting 00 through tension-type centering and rotation adjustment functions. Combined with the multi-degree-of-freedom adjustment system, it can adapt to various angle docking requirements, significantly improving the versatility and operational efficiency of this device.

[0042] like Figure 8 and Figure 9 As shown, the telescopic drive structure of the pad 305 includes: an electric push rod 306 fixedly installed inside the fixed cylinder 303; a drive block 307 fixedly installed at the end of the telescopic shaft of the electric push rod 306; and a second connecting arm 308 rotatably installed on each pad 305 corresponding to the drive block 307. When the electric push rod 306 is activated, the drive block 307 is controlled to move axially relative to the fixed cylinder 303, thereby driving all pads 305 to synchronously contract or open via each second connecting arm 308, achieving the centering and unlocking of the pipe fitting 00. This structure is easy to control, can adapt to pipe fittings 00 with different inner diameters, has a stable fixing effect, and is widely applicable.

[0043] like Figure 8 and Figure 10As shown, the linear drive structure of the moving ring 302 adopts a motor screw structure, and cooperates with a gear disk structure to implement synchronous transmission of multiple sets of screws, including: at least three sets of sixth screws 309 symmetrically rotated and mounted on the fixed frame 301, each sixth screw 309 being threadedly engaged with the moving ring 302; a seventh motor 310 is fixedly mounted on the fixed frame 301; a second gear 311 is fixedly mounted on the shaft end of each sixth screw 309; a gear disk 312 is rotatably mounted on the fixed frame 301, the gear disk 312 meshes with all the second gears 311, and is coaxially fixedly connected to the output shaft of the seventh motor 310. When the seventh motor 310 is started, the gear disk 312 rotates and synchronously drives each second gear 311 to rotate, driving the corresponding sixth screw 309 to rotate synchronously, providing smooth drive for the moving ring 302 and the pad block 305 to move forward and backward, avoiding damage to the inner wall of the pipe fitting 00 due to skew.

[0044] like Figure 10 As shown, the rotation drive structure of the fixed cylinder 303 adopts a motor gear set structure, and the gear set has a reduction transmission ratio, including: an eighth motor 313 fixedly installed in the moving ring 302; a third gear 314 fixedly installed on the output shaft of the eighth motor 313; and a fourth gear 315 fixedly installed on the fixed cylinder 303. The fourth gear 315 meshes with the third gear 314, and the number of teeth of the fourth gear 315 is greater than the number of teeth of the third gear 314 and is in a multiple relationship. When the eighth motor 313 is started, the fixed cylinder 303 drives the pipe fitting 00 to rotate circumferentially through the reduction transmission of the third gear 314 and the fourth gear 315. The angle control is more precise, which is conducive to further improving the docking and welding accuracy.

[0045] In this device, the clamping mechanism 30 achieves rapid centering and fixing through pneumatic tensioning. Combined with the drivable forward and backward structure and the adjustment structure that rotates around its own axis of the fixed cylinder 303, it can stably clamp pipe fittings 00 of different diameters and accurately adjust their circumferential phase, thereby improving the convenience of operation and the consistency of welding.

[0046] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the invention without departing from the principles and spirit of the invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for illustrative purposes only and is not intended to limit the invention; rather, the scope of protection is defined by the content of the claims.

Claims

1. A welding device for butt welding of pipe fittings, characterized in that, include: A base (101) is fixedly connected to supports (102) on both sides of the base (101). Each support (102) is slidably connected to a rail frame (103) and is equipped with a linear drive structure for driving the rail frame (103) to reciprocate laterally. Each rail frame (103) is slidably connected to a bracket (104) and is equipped with a linear drive structure for driving the bracket (104) to reciprocate vertically. Each bracket (104) is slidably connected to a semi-circular arc frame (105) and is equipped with an arc drive structure to drive the semi-circular arc frame (105) to slide in a circle with its own center point as the center. The two semi-circular arc frames (105) are staggered in the lateral direction. Each semi-circular arc frame (105) is fixedly connected to a welding gun (106) at the end. Two welding guns (106) are respectively set on the upper part of the corresponding semi-circular arc frame (105). The bottom edge and the upper edge, and the working surfaces of the two are located in the same transverse plane; a guide rail (201) extending longitudinally is fixedly connected to the base (101); two sets of moving frames (202) are slidably connected to the guide rail (201); a linear drive structure for driving the moving frame (202) to reciprocate longitudinal displacement is configured in the base (101); a rotating frame (203) is rotatably connected to each moving frame (202), and an angular displacement drive structure for driving the rotating frame (203) to rotate in opposite directions around its axis of rotation with that of the moving frame (202); a telescopic frame (204) is radially slidably connected to the rotating frame (203), and a linear drive structure for driving the telescopic frame (204) to reciprocate radial displacement relative to the rotating frame (203); a clamping mechanism (30) for clamping and fixing the pipe fitting (00) is provided on each telescopic frame (204).

2. The welding device for pipe fittings as described in claim 1, characterized in that, The clamping mechanism (30) includes: a fixed frame (301) fixedly connected to the telescopic frame (204); a movable ring (302) is axially slidably connected to the fixed frame (301), and a linear drive structure is configured to drive the movable ring (302) to move axially back and forth; a fixed cylinder (303) is rotatably connected to the movable ring (302), and a rotary drive structure is configured to drive the fixed cylinder (303) to rotate around its own axis; a first connecting arm (304) is rotatably connected to the outer periphery of the fixed cylinder (303); a pad (305) is rotatably connected to the end of the first connecting arm (304); at least three pads (305) are symmetrically arranged along the circumference of the fixed cylinder (303), and each pad (305) is connected to the fixed cylinder (303) through at least two first connecting arms (304); a telescopic drive structure is provided between the fixed cylinder (303) and each pad (305) for driving each pad (305) to unfold and retract uniformly.

3. The welding device for pipe fittings as described in claim 2, characterized in that, The arc drive structure of each semicircular arc frame (105) includes: a first gear (107) rotatably connected to the bracket (104); a semi-gear ring (108) fixedly connected to each semicircular arc frame (105), the semi-gear ring (108) meshing with the first gear (107); and a first motor (109) fixedly connected to the bracket (104), the output shaft of which is coaxially fixedly connected to the first gear (107).

4. The welding device for pipe fittings as described in claim 3, characterized in that, The linear drive structure corresponding to each bracket (104), the linear drive structure corresponding to each movable frame (202), the linear drive structure corresponding to each telescopic frame (204), and the linear drive structure of the movable ring (302) all adopt a motor screw structure.

5. The welding device for pipe fittings as described in claim 4, characterized in that, The linear drive structure of the two side rail frames (103) adopts a motor screw structure and the two share a set. The structure includes: a bidirectional screw (111) rotatably connected between the base (101) and the two side supports (102), and the threads on both sides of the bidirectional screw (111) are respectively threaded with the corresponding side rail frame (103); a second motor (112) is fixedly connected on one side support (102), and its output shaft is coaxially fixedly connected with the bidirectional screw (111).

6. The welding device for pipe fittings as described in claim 5, characterized in that, A fixed seat (210) is fixedly connected to the middle of the base (101); the angular displacement driving structure corresponding to each rotating frame (203) includes: two moving blocks (207) slidably disposed on the base (101) and respectively disposed on the lateral sides of the rotating frame (203); each moving block (207) is rotatably connected to the rotating frame (203) with a support arm (208); the two sides of the moving frame (202) are symmetrically rotatably connected with a fourth screw (209), and the fourth screw (209) on both sides is threadedly engaged with the moving block (207) on the same side respectively; The base (101) is symmetrically connected to spline rods (211) on both sides, and the spline rods (211) are splined with the fourth screw (209); the fixed seat (210) is fixedly connected to the fifth motor (212); the fixed seat (210) is rotatably connected to the transmission rod (213); a bevel gear (214) is provided between the fifth motor (212), the transmission rod (213) and the spline rod (211), and the fifth motor (212) drives the spline rods (211) on both sides to rotate synchronously through the transmission rod (213) and the bevel gear (214).

7. The welding device for pipe fittings as described in claim 6, characterized in that, The telescopic drive structure of the pad (305) includes: an electric push rod (306) fixedly connected in the fixed cylinder (303); a drive block (307) fixedly connected to the end of the telescopic shaft of the electric push rod (306); and a second connecting arm (308) rotatably connected to each pad (305) of the drive block (307).

8. The welding device for pipe fittings as described in claim 7, characterized in that, The rotation drive structure of the fixed cylinder (303) adopts a motor gear set structure, and the gear set has a reduction transmission ratio.

Images