An automatic welding mechanism for pipe circumferential welds

Abstract

This invention discloses an automatic welding mechanism for circumferential welds of pipelines, comprising a worktable with four casters connected to the bottom corners. Side guard plates are connected to the front and rear of the top of the worktable, and a steering shaft is rotatably connected to the upper part of each side guard plate. A tilting shell is connected between two steering shafts, with an opening at the top. A central shaft is rotatably connected to the center of the inner wall of the tilting shell, and a receiving seat is connected to the top of the central shaft. Several stepped holes are circumferentially formed on the top of the receiving seat, and a hollow tube is rotatably connected to the lower part of the inner cavity of each stepped hole. A tray is connected to the upper part of the outer wall of the hollow tube, and a welding frame is connected to the top left side of the worktable. This invention has a reasonable structural design, solving the problems of inaccurate positioning, low efficiency, and frequent manual intervention in traditional circumferential weld welding, and is suitable for batch welding of pipeline flanges.

Description

Technical Field

[0001] This invention relates to the field of welding mechanism technology, and in particular to an automatic welding mechanism for pipe circumferential welds. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials by heating, high temperature, or high pressure. To accommodate the welding of various products, a wide variety of welding equipment needs to be designed according to the welding method. In pipeline assembly, welding is often involved between flanges and pipe ends. The flange and pipe workpiece are placed in a rotating fixture and clamped, forming a circumferential weld at the contact end during welding.

[0003] Those skilled in the art have researched and improved upon this, proposing a flange welding device with application number CN202321535509.7. This technical solution uses an electric telescopic rod to lower the welding torch, allowing it to contact the flange for welding. However, this solution cannot perform continuous welding, requires frequent manual loading and unloading of materials, and cannot effectively position and clamp the pipe workpiece, affecting the welding quality. Therefore, we propose an automatic welding mechanism for pipe circumferential welds. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic welding mechanism for pipe circumferential welds to overcome the technical problems existing in the prior art.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention provides the following technical solution:

[0006] An automatic welding mechanism for pipe annular welds includes a workbench with four casters at the bottom corners, side guards at the front and rear of the top of the workbench, a steering shaft rotatably connected to the upper part of the side guards, a flip shell connected between two steering shafts, an opening at the top of the flip shell, a central shaft rotatably connected to the center of the inner wall of the flip shell, a receiving seat connected to the top of the central shaft, a plurality of stepped holes circumferentially opened on the top of the receiving seat, a hollow tube rotatably connected to the lower part of the inner cavity of the stepped holes, a tray connected to the upper part of the outer wall of the hollow tube, a welding frame connected to the top left side of the workbench, and a PLC controller connected to the front end of the workbench.

[0007] The top of the hollow tube is connected to a cylindrical shell. Three guide holes are circumferentially opened on the upper part of the side wall of the cylindrical shell. A trapezoidal block is movably inserted into the guide holes. The end of the trapezoidal block that extends out of the cylindrical shell has a protrusion. A tension spring is connected between the protrusion and the outer wall of the cylindrical shell. The end of the trapezoidal block that extends into the cylindrical shell has a downward inclined surface. A top column passes through the hollow tube. The upper end of the top column abuts against the inclined surface of the trapezoidal block. A wear-resistant ball is embedded in the lower end of the top column.

[0008] Several vertical rods are movably inserted into the bottom of the flip shell. A return spring is sleeved on the lower part of each vertical rod. The upper ends of the vertical rods are connected to an annular plate. The annular plate is coaxial with the central axis. A wear-resistant ball abuts against the upper surface of the annular plate. A metal block is connected to the lower ends of the vertical rods. An electromagnet is embedded in the center of the bottom of the flip shell. The electromagnet is located directly above the metal block. A clearance opening is provided at the upper right end of the flip shell. A drive motor is connected to the lower right end of the flip shell. A drive gear is connected to the top output end of the drive motor.

[0009] Preferably, in an automatic welding mechanism for pipe annular welds, an annular toothed groove is provided in the middle of the outer side wall of the receiving seat, and the end of the drive gear extending into the clearance opening meshes with the annular toothed groove. A sealing ring is connected to the upper part of the outer wall of the receiving seat, and a transmission cavity is provided in the upper part of the receiving seat. The transmission cavity communicates with the upper part of the stepped hole. A motor frame is connected to the top center of the top of the receiving seat, and a steering motor is connected to the top of the inner wall of the motor frame. The bottom output end of the steering motor extends into the transmission cavity and is connected to the main gear. A gear ring is connected to the outer side wall of the tray, and the gear ring meshes with the main gear.

[0010] Preferably, in an automatic welding mechanism for pipe annular welds, a stroke tube is connected to the top of the motor frame, a hydraulic rod is connected to the upper end of the stroke tube, a lifting block is connected to the lower end of the hydraulic rod, multiple traction rods are hinged to the outer wall of the lifting block, a vertical groove is opened in the wall of the stroke tube for the traction rods to pass through, a transverse rack is hinged to the lower end of the traction rod, multiple transmission housings are circumferentially connected to the top of the receiving seat, a vertical shaft is rotatably connected inside the transmission housing, a large gear and a small gear are connected vertically to the outer wall of the vertical shaft, and the end of the transverse rack extends into the transmission housing and meshes with the small gear.

[0011] Preferably, in an automatic welding mechanism for pipe annular welds, the top of the stepped hole is connected to a limiting plate at the front and rear. An L-shaped rod is movably inserted into the limiting plate. Two L-shaped rods are symmetrically connected to an arc plate on their adjacent sides. The arc plate has multiple rectangular openings along its length. A guide roller is rotatably connected inside the rectangular opening. A longitudinal rack is connected to the horizontal part of the L-shaped rod. The end of the longitudinal rack extends into the transmission housing and meshes with a large gear. The two longitudinal racks are arranged in a centrally symmetrical structure about the center of the large gear.

[0012] Preferably, in an automatic welding mechanism for pipe annular welds, an inclined platform is connected to the inner wall of the welding frame, a limiting groove is formed at the top of the inclined platform, a lead screw is rotatably connected in the limiting groove, a lead screw motor is connected to the lower end of the lead screw, a nut seat is screwed to the outer wall of the lead screw, a linkage frame is connected to the top of the nut seat, a welding gun is installed at the lower part of the linkage frame, the angle between the centerline of the lead screw and the horizontal plane is degrees, a vertical cylinder is connected to the top right side of the welding frame, a piston rod is connected to the bottom of the vertical cylinder, and a pressure block is rotatably connected to the lower end of the piston rod.

[0013] Preferably, in an automatic welding mechanism for pipe annular welds, an infrared signal transmitter is connected to the bottom left side of the inner cavity of the flipping shell, and a plurality of infrared signal receivers are circumferentially connected to the bottom of the receiving seat. When the infrared signal transmitter and the infrared signal receivers are aligned, the pressure block and the left stepped hole are arranged coaxially.

[0014] Preferably, in an automatic welding mechanism for pipe annular welds, a worm gear motor is connected to the outer wall of the rear side guard plate, and a worm is connected to the output end of the worm gear motor. A worm wheel is connected to the end of the rear steering shaft, and the worm wheel meshes with the worm. The spiral angle of the worm is smaller than the friction angle of the worm wheel and worm. A scale pointer is connected to the end of the front steering shaft, and an angle scale that matches the scale pointer is provided on the outer wall of the front side guard plate. A discharge port is provided on the right side of the worktable, and a guide slope is provided at the lower end of the discharge port. A rubber pad is connected to the top of the guide slope.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The present invention has a reasonable structural design, which can realize multi-station collaborative welding, improve work efficiency, and use a rotatable receiving base in conjunction with a PLC controller for programmed operation, which can realize the switching of workpiece positions, making it convenient to continuously complete the circumferential weld of multiple flanges and pipes. The accuracy of welding position switching is further ensured by infrared signal positioning setting.

[0017] 2. This invention can achieve adaptive clamping of the workpiece, avoid shaking during welding, and help ensure welding quality. It uses an electromagnet to attract a metal block to drive the expansion of the top column linkage trapezoidal block, thereby achieving rapid locking of the flange center hole. The distance between the two arc plates is adjustable to facilitate the flexible clamping of the pipe by the guide roller. After the pressure block is pressed down, it can abut against the top of the pipe and rotate synchronously to ensure uniform weld formation.

[0018] 3. In this invention, the welding torch is fed at an angle, which can effectively contact the welding position of the workpiece. After the welding torch retracts, the flip shell can achieve tilting and unloading through the worm gear mechanism. The finished workpiece falls into the unloading port. The guide slope is equipped with a rubber pad to take into account both the convenience of unloading and the protection of the workpiece.

[0019] In summary, this device, through its mechatronics design, solves the problems of inaccurate positioning, low efficiency, and frequent manual intervention in traditional circumferential weld welding, and is suitable for mass welding of pipe flanges. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a top view of the flip shell structure in this invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the flip shell in this invention;

[0025] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle;

[0026] Figure 6 This is a schematic diagram showing the positional distribution of the trapezoidal blocks in this invention;

[0027] Figure 7 This is a schematic diagram of the transmission cavity in this invention;

[0028] Figure 8 This is a schematic diagram of the stroke tube in this invention;

[0029] Figure 9 This is a schematic diagram of the L-shaped rod in this invention;

[0030] Figure 10 This is a schematic diagram of the transmission housing in this invention;

[0031] Figure 11 This is a schematic diagram of the arc plate in this invention;

[0032] Figure 12 This is a schematic diagram of the welding frame in this invention;

[0033] Figure 13 This is a schematic diagram of the completed workpiece.

[0034] In the diagram: 1. Workbench; 2. Casters; 3. Side guard plate; 4. Steering shaft; 5. Tilting shell; 6. Central shaft; 7. Receiving seat; 8. Stepped hole; 9. Hollow tube; 10. Pallet; 11. Welding frame; 12. PLC controller;

[0035] 31. Worm motor; 32. Worm; 41. Worm wheel; 42. Scale pointer;

[0036] 51. Vertical rod; 52. Circular plate; 53. Metal block; 54. Electromagnet; 55. Clearance opening; 56. Drive motor; 57. Drive gear; 58. Infrared signal transmitter; 59. Return spring;

[0037] 71. Annular toothed groove; 72. Sealing ring; 73. Transmission cavity; 74. Motor frame; 75. Steering motor; 76. Main gear; 77. Gear ring; 78. Transmission housing; 79. Infrared signal receiver;

[0038] 81. Limiting plate; 82. L-shaped rod; 83. Arc plate; 84. Rectangular opening; 85. Guide roller; 86. Longitudinal rack;

[0039] 91. Cylindrical shell; 92. Guide hole; 93. Trapezoidal block; 94. Tension spring; 95. Top post; 96. Wear-resistant ball;

[0040] 101. Discharge port; 102. Rubber pad;

[0041] 110. Pressure block; 111. Inclined platform; 112. Limiting groove; 113. Lead screw; 114. Lead screw motor; 115. Nut seat; 116. Linkage frame; 117. Welding torch; 118. Vertical cylinder; 119. Piston rod;

[0042] 741. Stroke tube; 742. Hydraulic rod; 743. Lifting block; 744. Traction rod; 745. Vertical groove; 746. Horizontal rack; 781. Vertical shaft; 782. Large gear; 783. Small gear. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0044] Please see Figure 1-13As shown, this embodiment is an automatic welding mechanism for pipe annular welds, including a workbench 1. The bottom four corners of the workbench 1 are connected to moving wheels 2. The top of the workbench 1 is connected to the front and rear of the side guard plates 3. The upper part of the side guard plates 3 is rotatably connected to the steering shaft 4. The two steering shafts 4 are connected to the flip shell 5. The upper end of the flip shell 5 is open. The center of the inner wall of the flip shell 5 is rotatably connected to the central shaft 6. The top of the central shaft 6 is connected to the receiving seat 7. The top of the receiving seat 7 is circumferentially provided with several stepped holes 8. The lower part of the inner cavity of the stepped holes 8 is rotatably connected to the hollow tube 9. The upper part of the outer wall of the hollow tube 9 is connected to the tray 10. The top left side of the workbench 1 is connected to the welding frame 11. The front end of the workbench 1 is connected to the PLC controller 12.

[0045] The top of the hollow tube 9 is connected to a cylindrical shell 91. Three guide holes 92 are circumferentially opened on the upper side wall of the cylindrical shell 91. A trapezoidal block 93 is movably inserted into the guide holes 92. The end of the trapezoidal block 93 that extends out of the cylindrical shell 91 has a protrusion. A tension spring 94 is connected between the protrusion and the outer wall of the cylindrical shell 91. The end of the trapezoidal block 93 that extends into the cylindrical shell 91 has a downward inclined surface. A top post 95 passes through the hollow tube 9. The upper end of the top post 95 abuts against the inclined surface of the trapezoidal block 93. A wear-resistant ball 96 is embedded in the lower end of the top post 95.

[0046] Several vertical rods 51 are movably inserted into the bottom of the flip shell 5. A return spring 59 is sleeved on the lower part of each vertical rod 51. The upper ends of the several vertical rods 51 are connected to an annular plate 52. The annular plate 52 is coaxial with the central shaft 6. Wear-resistant balls 96 abut against the upper surface of the annular plate 52. The lower ends of the several vertical rods 51 are connected to a metal block 53. An electromagnet 54 is embedded in the center of the bottom of the flip shell 5. The electromagnet 54 is located directly above the metal block 53. A clearance opening 55 is opened at the upper right end of the flip shell 5. A drive motor 56 is connected to the lower right end of the flip shell 5. A drive gear 57 is connected to the top output end of the drive motor 56.

[0047] The specific method of this embodiment is as follows:

[0048] When in use, this device is powered by an external power source. Multiple flanges are placed in each tray 10, and the joint pipe is placed on top of the flange. The PLC controller 12 controls the operation of each electrical component. The receiving seat 7 can rotate around the central axis 6, so that each tray 10 passes through the right side of the welding frame 11 in sequence. The welding frame 11 is used to weld the contact end of the joint pipe and the flange, thereby forming a ring weld.

[0049] When the flange is loaded, the center hole is fitted outside the cylindrical shell 91. The electromagnet 54 is energized to attract the metal block 53, which causes the vertical rod 51 to move the annular plate 52 upward. The upper surface of the annular plate 52 abuts against the wear-resistant ball 96, which causes the top column 95 to move upward and push the trapezoidal block 93. The trapezoidal block 93 extends along the guide hole 92 and abuts against the inner wall of the flange center hole, which can fix and limit the flange. The friction between the wear-resistant ball 96 and the annular plate 52 is small, which avoids hindering the deflection of the receiving seat 7. Example 2

[0050] The outer wall of the receiving seat 7 has an annular toothed groove 71 in the middle. The drive gear 57 extends into the relief opening 55 and meshes with the annular toothed groove 71. A sealing ring 72 is connected to the upper part of the outer wall of the receiving seat 7. A transmission cavity 73 is provided in the upper part of the receiving seat 7. The transmission cavity 73 is connected to the upper part of the stepped hole 8. A motor frame 74 is connected to the top center of the top of the receiving seat 7. A steering motor 75 is connected to the top of the inner wall of the motor frame 74. The bottom output end of the steering motor 75 extends into the transmission cavity 73 and is connected to the main gear 76. A gear ring 77 is connected to the outer wall of the tray 10. The gear ring 77 meshes with the main gear 76.

[0051] The top of the motor frame 74 is connected to a stroke tube 741, the upper end of the stroke tube 741 is connected to a hydraulic rod 742, the lower end of the hydraulic rod 742 is connected to a lifting block 743, the outer side wall of the lifting block 743 is hinged to multiple traction rods 744, the wall of the stroke tube 741 is provided with a vertical groove 745 for the traction rods 744 to pass through, the lower end of the traction rods 744 is hinged to a transverse rack 746, the top of the receiving seat 7 is circumferentially connected to multiple transmission housings 78, the vertical shaft 781 is rotatably connected inside the transmission housing 78, the outer wall of the vertical shaft 781 is connected to a large gear 782 and a small gear 783, and the end of the transverse rack 746 extends into the transmission housing 78 and meshes with the small gear 783.

[0052] The top of the stepped hole 8 is connected to a limiting plate 81 at the front and back. An L-shaped rod 82 is movably inserted into the limiting plate 81. An arc plate 83 is symmetrically connected to one side of the two L-shaped rods 82. The arc plate 83 has multiple rectangular openings 84 along its length. A guide roller 85 is rotatably connected inside the rectangular openings 84. A longitudinal rack 86 is connected to the horizontal part of the L-shaped rod 82. The end of the longitudinal rack 86 extends into the transmission housing 78 and meshes with a large gear 782. The two longitudinal racks 86 are arranged in a centrally symmetrical structure about the center of the large gear 782.

[0053] The specific method of this embodiment is as follows:

[0054] In this embodiment, during loading, the joint pipe is placed on top of the flange. The hydraulic rod 742 drives the lifting block 743 to descend, and the angle of the traction rod 744 changes accordingly. The upper end of the traction rod 744 moves down with the lifting block 743, and the lower end of the traction rod 744 drives the transverse rack 746 to translate. The end of the transverse rack 746 extends into the transmission housing 78 and meshes with the transmission pinion 783, so that the vertical shaft 781 drives the large gear 782 to rotate. The large gear 782 meshes with the longitudinal racks 86 on both sides of the transmission, so that the longitudinal racks 86 drive the L-shaped rod 82 to move. The distance between the two arc plates 83 decreases, and the guide roller 85 fits against the outer wall of the joint pipe to limit the movement without hindering the pipe from rotating around its own axis.

[0055] The drive motor 56 drives the drive gear 57 to rotate, and the drive gear 57 meshes with the transmission ring tooth groove 71, causing the receiving seat 7 to deflect the central shaft 6, which can realize the switching of the work position. When the workpiece reaches the welding position, the steering motor 75 drives the main gear 76 to rotate, and the main gear 76 meshes with the transmission ring tooth 77, so that the tray 10 can rotate around the axis of the hollow tube 9, which facilitates the welding processing of the annular weld. Example 3

[0056] Based on Embodiment 2, an inclined platform 111 is connected to the inner wall of the welding frame 11. A limiting groove 112 is formed at the top of the inclined platform 111. A lead screw 113 is rotatably connected in the limiting groove 112. A lead screw motor 114 is connected to the lower end of the lead screw 113. A nut seat 115 is screwed to the outer wall of the lead screw 113. A linkage frame 116 is connected to the top of the nut seat 115. A welding torch 117 is installed at the lower part of the linkage frame 116. The angle between the axis of the lead screw 113 and the horizontal plane is 45 degrees. A vertical cylinder 118 is connected to the top right side of the welding frame 11. A piston rod 119 is connected to the bottom of the vertical cylinder 118. A pressure block 110 is rotatably connected to the lower end of the piston rod 119.

[0057] An infrared signal transmitter 58 is connected to the bottom left side of the inner cavity of the flip shell 5, and several infrared signal receivers 79 are connected circumferentially to the bottom of the receiving base 7. When the infrared signal transmitter 58 and the infrared signal receivers 79 are aligned, the pressure block 110 is coaxial with the stepped hole 8 on the left side.

[0058] A worm motor 31 is connected to the outer wall of the rear side guard plate 3. A worm 32 is connected to the output end of the worm motor 31. A worm wheel 41 is connected to the end of the rear steering shaft 4. The worm wheel 41 meshes with the worm 32. The spiral angle of the worm 32 is smaller than the friction angle of the contact between the worm wheel 41 and the worm 32. A scale pointer 42 is connected to the end of the front steering shaft 4. An angle scale that matches the scale pointer 42 is provided on the outer wall of the front side guard plate 3 to achieve visual adjustment and enhance operational safety. A discharge port 101 is provided on the right side of the workbench 1. A guide slope is provided at the lower end of the discharge port 101. A rubber pad 102 is connected to the top of the guide slope.

[0059] The specific method of this embodiment is as follows:

[0060] In this embodiment, an infrared signal transmitter 58 emits a signal, and the position of the infrared signal receiver 79 moves with the rotation of the receiving seat 7. When the infrared signal transmitter 58 and the infrared signal receiver 79 are aligned, the working position is reached. At this time, the pressure block 110 and the left stepped hole 8 are coaxial. The drive motor 56 stops running, and the lead screw motor 114 drives the lead screw 113 to rotate. The nut seat 115 drives the linkage rod 116 to move. The working part of the welding torch 117 contacts the welding end of the pipe and the flange. The vertical cylinder 118 drives the piston rod 119 to descend, and the pressure block 110 presses the upper end of the pipe. After the steering motor 75 starts, the tray 10 drives the flange to rotate, and the pipe also rotates. This avoids the welding position from shifting and helps to ensure the welding quality of the circumferential weld.

[0061] After the welding work at a single station is completed, the vertical cylinder 118 drives the piston rod 119 to rise, the pressure block 110 disengages from the upper end of the pipe, the drive motor 56 continues to run to realize station switching, and the welding work is repeated until all workpieces are welded. The welding torch 117 is controlled to retract, the electromagnet 54 is de-energized and the reset spring 59 and tension spring 59 are reset, and the flange limit contact is established. The hydraulic rod 742 drives the lifting block 743 to rise, and the distance between the two arc plates 83 increases, releasing the limit on the pipe. After the worm motor 31 works, the worm 32 meshes with the transmission worm wheel 41, causing the steering shaft 4 to drive the tilting shell 5 to tilt. The finished workpiece falls into the lower discharge port 101. The rubber pad 102 is used to reduce impact damage. The container is placed at the lower end of the discharge slope for collection.

[0062] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic welding mechanism for pipe annular welds, comprising a worktable (1), characterized in that: The workbench (1) has four casters (2) at the bottom corners. The workbench (1) has side guards (3) at the top front and back. The upper part of the side guards (3) is rotatably connected to a steering shaft (4). A flip shell (5) is connected between the two steering shafts (4). The flip shell (5) has an opening at the top. A central shaft (6) is rotatably connected to the center of the inner wall of the flip shell (5). A receiving seat (7) is connected to the top of the central shaft (6). Several stepped holes (8) are opened around the top of the receiving seat (7). A hollow tube (9) is rotatably connected to the lower part of the inner cavity of the stepped hole (8). A tray (10) is connected to the upper part of the outer wall of the hollow tube (9). A welding frame (11) is connected to the top left side of the workbench (1). A PLC controller (12) is connected to the front end of the workbench (1). The top of the hollow tube (9) is connected to a cylindrical shell (91). Three guide holes (92) are circumferentially opened on the upper side wall of the cylindrical shell (91). A trapezoidal block (93) is movably inserted into the guide holes (92). One end of the trapezoidal block (93) extending out of the cylindrical shell (91) is provided with a protrusion. A tension spring (94) is connected between the protrusion and the outer wall of the cylindrical shell (91). One end of the trapezoidal block (93) extending into the cylindrical shell (91) is provided with a downward inclined surface. A top post (95) passes through the hollow tube (9). The upper end of the top post (95) abuts against the inclined surface of the trapezoidal block (93). A wear-resistant ball (96) is embedded in the lower end of the top post (95). The bottom of the flip shell (5) is movably connected to several vertical rods (51). The lower part of each vertical rod (51) is fitted with a return spring (59). The upper ends of the several vertical rods (51) are connected to an annular plate (52). The annular plate (52) is coaxial with the central axis (6). The wear-resistant ball (96) abuts against the upper surface of the annular plate (52). The lower ends of the several vertical rods (51) are connected to a metal block (53). An electromagnet (54) is embedded in the center of the bottom of the flip shell (5). The electromagnet (54) is located directly above the metal block (53). A clearance opening (55) is opened at the upper right end of the flip shell (5). A drive motor (56) is connected to the lower right end of the flip shell (5). A drive gear (57) is connected to the top output end of the drive motor (56).

2. The automatic welding mechanism for pipe circumferential welds according to claim 1, characterized in that: The outer wall of the receiving seat (7) is provided with an annular tooth groove (71). The end of the drive gear (57) that extends into the relief opening (55) meshes with the annular tooth groove (71). A sealing ring (72) is connected to the upper part of the outer wall of the receiving seat (7). A transmission cavity (73) is provided in the upper part of the receiving seat (7). The transmission cavity (73) is connected to the upper part of the stepped hole (8). A motor frame (74) is connected to the top center of the receiving seat (7). A steering motor (75) is connected to the top of the inner wall of the motor frame (74). The bottom output end of the steering motor (75) extends into the transmission cavity (73) and is connected to the main gear (76). A gear ring (77) is connected to the outer wall of the tray (10). The gear ring (77) meshes with the main gear (76).

3. The automatic welding mechanism for pipe circumferential welds according to claim 2, characterized in that: The top of the motor frame (74) is connected to a stroke tube (741), the upper end of the stroke tube (741) is connected to a hydraulic rod (742), the lower end of the hydraulic rod (742) is connected to a lifting block (743), the outer side wall of the lifting block (743) is hinged to multiple traction rods (744), the wall of the stroke tube (741) is provided with a vertical groove (745) for the traction rods (744) to pass through, the lower end of the traction rods (744) is hinged to a transverse rack (746), the top of the receiving seat (7) is circumferentially connected to multiple transmission housings (78), the transmission housing (78) is rotatably connected to a vertical shaft (781), the outer wall of the vertical shaft (781) is connected to a large gear (782) and a small gear (783) on the upper and lower sides, and the end of the transverse rack (746) extends into the transmission housing (78) and meshes with the small gear (783).

4. The automatic welding mechanism for pipe circumferential welds according to claim 3, characterized in that: The top of the stepped hole (8) is connected to a limiting plate (81) at the front and back. An L-shaped rod (82) is movably inserted into the limiting plate (81). An arc plate (83) is symmetrically connected to the two L-shaped rods (82) on the side close to each other. The arc plate (83) has multiple rectangular openings (84) along its length. A guide roller (85) is rotatably connected inside the rectangular opening (84). A longitudinal rack (86) is connected to the horizontal part of the L-shaped rod (82). The end of the longitudinal rack (86) extends into the transmission housing (78) and meshes with the large gear (782). The two longitudinal racks (86) are arranged in a centrally symmetrical structure about the center of the large gear (782).

5. The automatic welding mechanism for pipe circumferential welds according to claim 1, characterized in that: The welding frame (11) has an inclined platform (111) connected to its inner wall. A limiting groove (112) is provided at the top of the inclined platform (111). A lead screw (113) is rotatably connected in the limiting groove (112). A lead screw motor (114) is connected to the lower end of the lead screw (113). A nut seat (115) is screwed to the outer wall of the lead screw (113). A linkage frame (116) is connected to the top of the nut seat (115). A welding gun (117) is installed at the lower part of the linkage frame (116). The angle between the axis of the lead screw (113) and the horizontal plane is 45 degrees. A vertical cylinder (118) is connected to the top right side of the welding frame (11). A piston rod (119) is connected to the bottom of the vertical cylinder (118). A pressure block (110) is rotatably connected to the lower end of the piston rod (119).

6. The automatic welding mechanism for pipe circumferential welds according to claim 5, characterized in that: An infrared signal transmitter (58) is connected to the bottom left of the inner cavity of the flip shell (5), and several infrared signal receivers (79) are connected to the bottom circumferentially of the receiving seat (7). When the infrared signal transmitter (58) and the infrared signal receivers (79) are aligned, the pressure block (110) and the left stepped hole (8) are arranged coaxially.

7. The automatic welding mechanism for pipe circumferential welds according to claim 1, characterized in that: A worm motor (31) is connected to the outer wall of the rear side guard plate (3). A worm (32) is connected to the output end of the worm motor (31). A worm wheel (41) is connected to the end of the rear steering shaft (4). The worm wheel (41) meshes with the worm (32). The spiral angle of the worm (32) is smaller than the friction angle of the worm wheel (41) and the worm (32) in contact. A scale pointer (42) is connected to the end of the front steering shaft (4). An angle scale that matches the scale pointer (42) is provided on the outer wall of the front side guard plate (3). A discharge port (101) is provided on the right side of the workbench (1). A guide slope is provided at the lower end of the discharge port (101). A rubber pad (102) is connected to the top of the guide slope.

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